创建spring项目步骤一

发布时间：2020-07-26 22:18:05 来源：网络阅读：861 作者：青羽的疯狂栏目：编程语言

前言

该文档主要介绍如何创建一个简单的、能够正常运行的spring项目。为往后项目的开发提供便利

创建spring项目

创建maven项目

使用sts开发软件创建项目,STS是Spring Tool Suite的简称，该软件是一个基于Eclipse环境的，用于开发spring应用程序的软件。其提供了很多spring相关的辅助工具，为开发项目提供诸多便利。

创建spring项目步骤一

导入spring-mvc jar包

编辑spring项目的pom.xml文件，加入spring-mvc容器相关jar依赖、spring-ioc容器相关的jar

<project xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.bear.simple_spring</groupId>
    <artifactId>simple_spring</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <dependencies>
        <!-- 导入springmvc jar包 begin -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.1.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>5.1.2.RELEASE</version>
        </dependency>
        <!-- 导入springmvc json与对象转换jar【@RequestBody、@ResponseBody ...注解生效】-->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.9.8</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml</groupId>
            <artifactId>classmate</artifactId>
            <version>1.4.0</version>
        </dependency>
    </dependencies>
</project>

配置servlet容器web.xml

编辑web.xml文件，让servlet容器启动的时候加载spring-mvc配置文件及spring-ioc的配置文件，以启动spring-mvc容器与spring-ioc容器

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
    <!-- 配置servlet 容器加载 spring-mvc配置文件，使servlet容器启动的时候同时启动spring-mvc容器 -->
    <servlet>
        <servlet-name>springDispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <!-- 配置spring-mvc路径 -->
            <param-value>classpath:spring-mvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <!-- Map all requests to the DispatcherServlet for handling -->
    <servlet-mapping>
        <servlet-name>springDispatcherServlet</servlet-name>
        <!-- 配置 spring-mvc拦截的请求 -->
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!-- 配置servlet 容器加载 spring-ioc配置文件，使servlet容器启动的时候同时启动spring-ioc容器 -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:spring-beans.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
</web-app>

创建spring-mvc容器的配置文件【spring-mvc.xml】

创建spring-mvc的配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
        http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context-4.3.xsd">
    <!-- 配置spring 扫描包 -->
    <context:component-scan base-package="com.bear.simple.spring" use-default-filters="false">
        <!-- 配置 spring-mvc 只扫描的注解Controller【处理http请求注解】、 ControllerAdvice【处理异常的注解】-->
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
        <context:include-filter type="annotation" expression="org.springframework.web.bind.annotation.ControllerAdvice"/>
    </context:component-scan>

    <!-- 配置spring jsp 的试图解析器 【如不需要用到模板，可不配置】-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/views/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>

    <!-- 配置支持静态文件访问 -->
    <mvc:default-servlet-handler/>

    <!-- 配置注解驱动，让RequestMapping 、异常处理等注解生效 -->
    <mvc:annotation-driven></mvc:annotation-driven>
</beans>

创建spring-ioc容器的配置文件【spring-beans.xml】

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
        http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context-4.3.xsd">
    <!-- 配置spring-ioc容器扫描的包，并排除 扫描Controller、ControllerAdvice【这两个注解交由spring-mvc容器扫描】-->
    <context:component-scan base-package="com.bear.simple.spring">
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
        <context:exclude-filter type="annotation" expression="org.springframework.web.bind.annotation.ControllerAdvice"/>       
    </context:component-scan>
</beans>

测试spring-mvc项目是否创建成功

编写controller

package com.bear.simple.spring.controller;

import javax.servlet.http.HttpServletRequest;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import com.bear.simple.spring.entity.Account;
import com.bear.simple.spring.service.AccountService;

@RestController
@RequestMapping("account")
public class AccountController {

@Autowired
private AccountService accountService;

/**
 * 获取帐号信息
 * @param id
 * @param request
 * @return
 */
@RequestMapping("/get")
public Account getAccount(@RequestParam String id,HttpServletRequest request) {
    if(null == id || "".equals(id)) 
        throw new RuntimeException("请求参数缺少id");
    Account result = accountService.loadAccountById(id);
    return result;
}
}

编写实体层

package com.bear.simple.spring.entity;

/**
* 登陆帐号信息
* @author bear
*
*
public class Account {
//登陆帐号ID
private String id;
//登陆帐号
private String acccountNo;
//帐号密码
private String password;
//帐号描述
private String desc;
//帐号是否启用 0 禁用 1启用，默认为启用
private int enable = 1;

public Account(String id, String acccountNo, String password) {
    super();
    this.id = id;
    this.acccountNo = acccountNo;
    this.password = password;
}

public Account(String id, String acccountNo, String password, String desc, int enable) {
    super();
    this.id = id;
    this.acccountNo = acccountNo;
    this.password = password;
    this.desc = desc;
    this.enable = enable;
}

public Account() {
    super();
}

public String getId() {
    return id;
}

public void setId(String id) {
    this.id = id;
}

public String getAcccountNo() {
    return acccountNo;
}

public void setAcccountNo(String acccountNo) {
    this.acccountNo = acccountNo;
}

public String getPassword() {
    return password;
}

public void setPassword(String password) {
    this.password = password;
}

public int getEnable() {
    return enable;
}

public void setEnable(int enable) {
    this.enable = enable;
}

public Boolean isEnable() {
    return 1 == this.enable;
}

@Override
public int hashCode() {
    final int prime = 31;
    int result = 1;
    result = prime * result + ((acccountNo == null) ? 0 : acccountNo.hashCode());
    result = prime * result + ((desc == null) ? 0 : desc.hashCode());
    result = prime * result + enable;
    result = prime * result + ((id == null) ? 0 : id.hashCode());
    result = prime * result + ((password == null) ? 0 : password.hashCode());
    return result;
}

@Override
public boolean equals(Object obj) {
    if (this == obj)
        return true;
    if (obj == null)
        return false;
    if (getClass() != obj.getClass())
        return false;
    Account other = (Account) obj;
    if (acccountNo == null) {
        if (other.acccountNo != null)
            return false;
    } else if (!acccountNo.equals(other.acccountNo))
        return false;
    if (desc == null) {
        if (other.desc != null)
            return false;
    } else if (!desc.equals(other.desc))
        return false;
    if (enable != other.enable)
        return false;
    if (id == null) {
        if (other.id != null)
            return false;
    } else if (!id.equals(other.id))
        return false;
    if (password == null) {
        if (other.password != null)
            return false;
    } else if (!password.equals(other.password))
        return false;
    return true;
}

@Override
public String toString() {
    return "Account [id=" + id + ", acccountNo=" + acccountNo + ", password=" + password + ", desc=" + desc
            + ", enable=" + enable + "]";
}

}

编写服务层

package com.bear.simple.spring.service;

import java.util.HashMap;
import java.util.Map;
import java.util.Optional;

import org.springframework.stereotype.Service;

import com.bear.simple.spring.entity.Account;

@Service
public class AccountService {

private static final Map<String, Account> cache = new HashMap<String, Account>();

static {
    cache.put("1", new Account("1", "黄大仙", "123456"));
    cache.put("2", new Account("2", "刘不三", "12345678"));
    cache.put("3", new Account("3", "刘不四", "8888888"));
}

/**
 * 加载帐号，不存在报异常
 * 
 * @param id
 * @return
 */
public Account loadAccountById(String id) {
    Optional<Account> accountOpt = findAccountById(id);
    if (!accountOpt.isPresent())
        throw new RuntimeException(String.format("帐号【%s】不存在", id));
    return accountOpt.get();
}

/**
 * 查找帐号
 * 
 * @param id
 * @return
 */
public Optional<Account> findAccountById(String id) {
    if (null == id || "".equals(id))
        return Optional.empty();
    Account account = cache.get(id);
    return Optional.ofNullable(account);
}

}

测试请求处理

使用postman软件测试

统一返回结果

编写返回结果实体类【该类包含成功返回，异常返回与错误返回】

package com.bear.simple.spring.entity;

import java.io.PrintWriter;
import java.io.StringWriter;

public class JsonData {
//是否正确返回
private final boolean ret;
//状态码
private String code = "000";
//数据
private Object data;
//提示信息
private String msg;
//异常详细信息
private String detail;

private JsonData(boolean ret) {
    this.ret = ret;
}   
/**
 * 创建错误返回结果
 * @param msg 提示信息
 * @return
 */
public static JsonData error(String msg) {
    JsonData result = new JsonData(false);
    result.msg = msg;
    result.code = "999";
    return result;
}

public static JsonData error(String msg,Exception e,String code) {
    JsonData result = new JsonData(false);
    result.msg = msg;
    result.code = code;
    result.detail = getStackTraceInfo(e);
    return result;
}

public static JsonData error(Exception e) {
    JsonData result = new JsonData(false);
    result.msg = e.getMessage();
    result.code = "999";
    result.detail = getStackTraceInfo(e);
    return result;
}

public static JsonData error(Exception e,String code) {
    JsonData result = new JsonData(false);
    result.msg = e.getMessage();
    result.code = code;
    result.detail = getStackTraceInfo(e);
    return result;
}

public static JsonData success(Object data,String msg) {
    JsonData result = new JsonData(true);
    result.msg = msg;
    result.data = data;
    return result;
}
public static JsonData success(Object data) {
    return success(data, null);
}

public static JsonData success() {
    return success(null,null);
}

public String getCode() {
    return code;
}

public Object getData() {
    return data;
}

public String getMsg() {
    return msg;
}

public String getDetail() {
    return detail;
}

public boolean isRet() {
    return ret;
}

/**
 * 打印异常堆栈信息
 * @param e
 * @return
 */
public static String getStackTraceInfo(Exception e) {
      StringWriter sw = new StringWriter();
      PrintWriter pw = new PrintWriter(sw);
      try {
          e.printStackTrace(pw);
          pw.flush();
          sw.flush();
          return sw.toString();
      } finally {
          try {
              pw.close();
          } catch (Exception ex) {
              ex.printStackTrace();
          }
          try {
              sw.close();
          } catch (Exception ex) {
              ex.printStackTrace();
          }
      }
  }

}

统一异常处理

编写异常处理控制器（统一处理系统发生的所有异常）

package com.bear.simple.spring.controller;

import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;

import com.bear.simple.spring.entity.JsonData;

@ControllerAdvice
public class ExceptionController {

    /**
     * 处理特定异常
     * @param ex
     * @return
     */
    @ExceptionHandler
    @ResponseBody
    public JsonData handleUserNotExistException(UserNotExistException ex) {
        if(null == ex.getMessage() || "".equals(ex.getMessage()))
            return JsonData.error("用户不存在", ex, "998");
        return JsonData.error(ex, "998");
    }

    /**
     * 处理上述遗漏的异常
     * @param ex
     * @return
     */
    @ExceptionHandler
    @ResponseBody
    public JsonData handleUserNotExistException(Exception ex) {
        if(null == ex.getMessage() || "".equals(ex.getMessage()))
            return JsonData.error("系统发生未知异常", ex, "999");
        return JsonData.error(ex, "999");
    }
}

添加日志处理

日志记录是项目中不可或缺的一部分。它的存在让我们定位问题更为方便。目前使用比较普遍的日志框架有log4j、logback等。当前项目将采用logback。
引用logback相应jar包

<dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.21</version>
        </dependency>
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-core</artifactId>
            <version>1.1.7</version>
        </dependency>
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-classic</artifactId>
            <version>1.1.7</version>
        </dependency>

编写日志配置文件【logback.xml(名称可自定义)】

<?xml version="1.0" encoding="UTF-8"?>
<!-- scan 为 true 扫描logback.xml文件，一旦发现文件更新，则重新加载，scanPeriod 为扫描时间间隔 -->
<configuration scan="true" scanPeriod="60 seconds" debug="false">
<!-- 变量定义 在logback.xml文件中使用${}应用 -->
<property name="appName" value="simpleSpringLog" />
<!-- 定义日志输出路径 -->
<property name="logFilePath" value="C:/sts_workspace/log" />
<!-- logback上下文名称定义 -->
<contextName>${appName}</contextName>

<!-- 控制台日志输出配置 -->
<appender name="STDOUT"
    class="ch.qos.logback.core.ConsoleAppender">
    <!-- encoder 默认配置为PatternLayoutEncoder -->
    <encoder>
        <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
        </pattern>
    </encoder>
</appender>

<!-- 文件日志输出配置 -->
<appender name="FILE" class="ch.qos.logback.core.FileAppender">
    <file>${logFilePath}/testFile.log</file>
    <append>true</append>
    <encoder>
        <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
        </pattern>
    </encoder>
</appender>

<!-- 滚动日志输出，每天生成一个日志文件 -->
<appender name="ROLL_FILE"
    class="ch.qos.logback.core.rolling.RollingFileAppender">
    <!-- 配置滚动策略 -->
    <rollingPolicy
        class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
        <fileNamePattern>${logFilePath}/%d{yyyy-MM-dd}.log</fileNamePattern>
        <maxHistory>30</maxHistory>
    </rollingPolicy>
    <!-- 配置日志输出格式 -->
    <encoder>
        <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
        </pattern>
    </encoder>
</appender>

<appender name="TIMEOUT_ROLL_FILE"
        class="ch.qos.logback.core.rolling.RollingFileAppender">
        <!-- 定义日志过滤器 -->
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>INFO</level>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>
        <!-- 配置滚动策略 -->
        <rollingPolicy
            class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>${logFilePath}/timeout/%d{yyyy-MM-dd}.log</fileNamePattern>
            <maxHistory>30</maxHistory>
        </rollingPolicy>
        <!-- 配置日志输出格式 -->
        <encoder>
            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
            </pattern>
        </encoder>
    </appender>

<!-- 定义指定类路径输出日志 -->
<logger name="com.bear.simple.spring.service" level="INFO"
    additivity="false">
    <appender-ref ref="STDOUT" />
    <appender-ref ref="ROLL_FILE" />
</logger>
<logger name="org" level="INFO"/>
<!-- 设置root的打印配置，将等级【level="INFO"】大于INFO的日志打印到控制台【ref="STDOUT"】 -->
<root level="INFO">
    <appender-ref ref="STDOUT" />
    <appender-ref ref="ROLL_FILE" />
</root>
</configuration>

使用springmvc启动加载日志配置文件，编辑web.xml文件使用配置监听器加载日志配置文件，只需在web.xml文件中添加如下代码段即可

<context-param>
    <param-name>logbackConfigLocation</param-name>
    <!-- 日志配置文件地址 -->
    <param-value>C:/developer/apache-tomcat-8.0.32/web_log/logback.xml</param-value>
</context-param>
<listener>
    <listener-class>ch.qos.logback.ext.spring.web.LogbackConfigListener</listener-class>
</listener>

配置统一编码过滤器

配置springmvc接收的所有请求的编码格式为utf-8,只需在web.xml文件中添加字符集过滤器即可，添加的内容如下

<!-- 统一字符编码过滤器 -->
<filter>
    <filter-name>characterEncodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <!-- 字符编码 -->
    <init-param>
        <param-name>encoding</param-name>
        <param-value>UTF-8</param-value>
    </init-param>
    <!-- 是否强制所有请求都使用该字符编码 -->
    <init-param>
        <param-name>forceEncoding</param-name>
        <param-value>true</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>characterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

向AI问一下细节

创建spring项目步骤一

前言

创建spring项目

创建maven项目

导入spring-mvc jar包

配置servlet容器web.xml

创建spring-mvc容器的配置文件【spring-mvc.xml】

创建spring-ioc容器的配置文件【spring-beans.xml】

测试spring-mvc项目是否创建成功

统一返回结果

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