SpringMVC -- 梗概--源码--壹--收参

Spring MVC 参数处理

最新推荐文章于 2017-04-15 23:53:00 发布

原创最新推荐文章于 2017-04-15 23:53:00 发布 · 100 阅读

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CC 4.0 BY-SA版权

本文介绍了一个使用Spring MVC框架实现的示例项目，演示了如何通过不同的方式进行参数接收，包括基本类型参数、实体类参数、数组及集合类型的参数接收，并展示了如何解决参数乱码问题。

附：实体类

Class ： User

package com.c61.entity;

import java.text.SimpleDateFormat;
import java.util.Date;

import org.springframework.format.annotation.DateTimeFormat;

import com.alibaba.fastjson.annotation.JSONField;

public class User {
    private Integer id;
    private String name;
    //@DateTimeFormat(pattern="yyyy-MM-dd HH:mm:ss")
    @DateTimeFormat(pattern="yyyy-MM-dd")//定制在接收请求参数时的日期格式
    @JSONField(format="yyyy-MM-dd")//作用在java序列化成json时
    private Date birth;
    private String dateStr;
    
    public String getDateStr() {
        return dateStr;
    }
    public void setDateStr(String dateStr) {
        this.dateStr = dateStr;
    }
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Date getBirth() {
        return birth;
    }
    public void setBirth(Date birth) {
        this.birth = birth;
        SimpleDateFormat format=new SimpleDateFormat("yyyy-MM-dd");
        this.dateStr=format.format(birth);
    }
    @Override
    public String toString() {
        return "User [id=" + id + ", name=" + name + ", birth=" + birth + "]";
    }
    public User(){}
    public User(Integer id, String name, Date birth) {
        super();
        this.id = id;
        this.name = name;
        this.birth = birth;
    }
    
}

Class : ValueObject

package com.c61.entity;

import java.util.List;

public class ValueObject{
    private List<User> users;
    private String[] ids;
    public List<User> getUsers() {
        return users;
    }
    public void setUsers(List<User> users) {
        this.users = users;
    }
    public String[] getIds() {
        return ids;
    }
    public void setIds(String[] ids) {
        this.ids = ids;
    }
}

-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

1.配置web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
    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_2_5.xsd">
  <display-name></display-name>    
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  
  <!-- 前端控制器 
         /=默认的url-pattern
         /a/b/c  /a
         
         /a/d/c
         /a/d
         /a
         /
         *注意：此控制器默认加载/WEB-INF下的xxx-servlet.xml文件
                        ：其中xxx等于【DispatcherServlet的配置名】
  -->
  <servlet>
      <servlet-name>mvc61</servlet-name>
      <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
      <init-param>
          <param-name>contextConfigLocation</param-name>
          <param-value>classpath:mvc62.xml</param-value>
      </init-param>
      <!-- 随项目启动而启动 -->
      <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
      <servlet-name>mvc61</servlet-name>
      <url-pattern>/</url-pattern>
  </servlet-mapping>
  
  <!-- 专治Post请求参数乱码 -->
  <filter>
      <filter-name>encoding61</filter-name>
      <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
      <!-- 将请求的编码方式设置为utf-8 -->
      <init-param>
          <param-name>encoding</param-name>
          <param-value>utf-8</param-value>
      </init-param>
  </filter>
  <filter-mapping>
      <filter-name>encoding61</filter-name>
      <url-pattern>/*</url-pattern>
  </filter-mapping>
</web-app>

2.配置控制器

Class ： ParamController

package com.c61.controller;

import java.util.Date;

import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

import com.c61.entity.User;
import com.c61.entity.ValueObject;

/**
 * 
 * @author admin
 * 收参测试  controller
 */
@Controller
@RequestMapping(value="/mvc")//等价于namespace
public class ParamController {
    /**
     * 
     * @param name
     * @param id
     * @param birth
     * @return
     * 零散传参：请求参数和方法参数同名即可
     */
    //url?id=61&name=zhoushanlin&birth=2016/09/29 11:15:40
    @RequestMapping("/param")//等价于<action name="mvc1"
    public String testMVC(String name,Integer id,Date birth){
        System.out.println(name+" "+id+" "+birth);
        return "index";
    }
    
    /**
     * 
     * @param name
     * @param id
     * @param birth
     * @return
     * 零散传参
     * 细节：
     *  @RequestParam(required=true,defaultValue="lime",value="abc")
     *      required=参数是否是必需传递的，如果参数上加了此注解，则required默认为true
     *      defaultValue=参数的默认值，如果参数没有收到数据，则取默认值
     *      value=定制请求参数的名称
     *  @DateTimeFormat(pattern="yyyy-MM-dd")
     *      pattern=定制日期的收参格式
     */
    //url?id=61&name=zhoushanlin&birth=2016/09/29 11:15:40
    @RequestMapping("/param2")//等价于<action name="mvc1"
    public String testMVC2(@RequestParam(required=true,defaultValue="lime") String name,
                           @RequestParam Integer id,
                           @RequestParam(value="b") @DateTimeFormat(pattern="yyyy-MM-dd")Date birth){
        System.out.println(name+" "+id+" "+birth);
        return "index";
    }
    /**
     * 以实体为整体
     * url?id=61&name=c61&birth=2016/09/29
     * *请求参数名 要和 实体属性名同名即可
     */
    @RequestMapping("/param3")//等价于<action name="mvc1"
    public String testMVC3(User user){
        System.out.println(user);
        return "index";
    }
    /**
     * url?hobby61=xxx&hobby61=xxx&hobby61=xxxx
     * 以数组为整体1
     */
    @RequestMapping("/param4")//等价于<action name="mvc1"
    public String testMVC4(String[] hobby61){
        for(String hobby:hobby61){
            System.out.println(hobby);
        }
        return "index";
    }
    /**
     * 以集合为整体  (了解)
     * url?users[0].id=1&users[0].name=c61&users[0].birth=2016-09-29
     *     &users[1].id=2&users[1].name=c61&users[1].birth=2016-09-29
     *     &users[2].id=3&users[2].name=c61&users[2].birth=2016-09-29
     */
    @RequestMapping("/param5")//等价于<action name="mvc1"
    public String testMVC5(ValueObject vo61){
        for(User user:vo61.getUsers()){
            System.out.println(user);
        }
        return "index";
    }
}

3 配置视图

View ： index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'index.jsp' starting page</title>
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
  </head>
  
  <body>
    This is my JSP page. <br>
  </body>
</html>

零散收参 : 请求参数名要和方法参数名同名即可

View : param.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'index.jsp' starting page</title>
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
  </head>
  
  <body>
    <form method="post" action="${pageContext.request.contextPath}/mvc/param">
        <input type="text" name="id"/>
        <input type="text" name="name"/>
        <input type="text" name="birth"/><br/>
        <input type="submit" value="提交"/>
    </form>
  </body>
</html>

Console :

实体为整体收参 : 请求参数名要和实体属性名同名即可

View ： param.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'index.jsp' starting page</title>
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
  </head>
  
  <body>
    <form method="post" action="${pageContext.request.contextPath}/mvc/param3">
        <input type="text" name="id"/>
        <input type="text" name="name"/>
        <input type="text" name="birth"/><br/>
        <input type="submit" value="提交"/>
    </form>
  </body>
</html>

Console ：

数组为整体收参：

View ： param.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'index.jsp' starting page</title>
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
  </head>
  
  <body>
    <form method="post" action="${pageContext.request.contextPath}/mvc/param4">
        <label><input name="hobby61" type="checkbox" value="hiking" />徒步旅行</label> 
        <label><input name="hobby61" type="checkbox" value="swimming" />游泳</label> 
        <input type="submit" value="提交"/>
    </form>
  </body>
</html>

Console :

集合为整体收参：

View ： param.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'index.jsp' starting page</title>
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">    
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
  </head>
  
  <body>
    <form method="post" action="${pageContext.request.contextPath}/mvc/param5">
    用户A：<br>
        <input name="users[0].id" type="text" value="" />
        <input name="users[0].name" type="text" value="" />
        <input name="users[0].birth" type="text" value="" /><br>
    用户B：<br>
        <input name="users[1].id" type="text" value="" />
        <input name="users[1].name" type="text" value="" />
        <input name="users[1].birth" type="text" value="" /><br>
        <input type="submit" value="提交"/>
    </form>
  </body>
</html>

Console :

收参乱码：

1>get请求：在服务器的配置中添加URIEncoding="utf-8"
2>post请求：在项目中注册CharacterEncodingFilter

<!-- 专治Post请求参数乱码 -->
  <filter>
      <filter-name>encoding61</filter-name>
      <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
      <!-- 将请求的编码方式设置为utf-8 -->
      <init-param>
          <param-name>encoding</param-name>
          <param-value>utf-8</param-value>
      </init-param>
  </filter>
  <filter-mapping>
      <filter-name>encoding61</filter-name>
      <url-pattern>/*</url-pattern>
  </filter-mapping>