springmvc学习笔记（七）数据传递及乱码问题

先做个例子：在页面输入数据传递到Controller处理，再返回到页面显示数据．

１.Controller类

@Controller
@RequestMapping("/user")
public class UserController {
	@RequestMapping("/addUser")
	public String addUser(String name, String age, HttpServletRequest request){
		request.setAttribute("result", "addUser-----");
		System.out.println("name=" + name);
		request.setAttribute("result", name);
		return "annotation";
	}
	@RequestMapping("/delUser")
	public String delUser(HttpServletRequest request){
		request.setAttribute("result", "delUser-----");
		return "annotation";
	}
	
	@RequestMapping("/toUser")
	public String toUser(HttpServletRequest request){
		request.setAttribute("result", "toUser-----");
		return "adduserView";
	}
}

２.adduserView.jsp　输入数据页面．

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>


<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>   

  
    
  
  
	

		姓名：

		年龄：

		
	

  

这里先以get方式请求吧，把document.form[0].method="post"改为document.form[0].method="get"

３.显示数据页面 annotatio.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>


<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>   

  
    
    
  
  
  
	
spring mvc学习笔记之注解开启

	

		${result }
	
  

４.部署测试，输入中文字符串，页面显示乱码

get方式传递参数造成的乱码可这样修改：

Tomcat下的server.xml

添加了一个URIEncoding="UTF-8"

５.Post方式传递数据乱码解决．

	@RequestMapping("/addUser")
	public String addUser(String name, String age, HttpServletRequest request){
		request.setAttribute("result", "addUser-----");
		try {
			name = new String(name.getBytes("iso-8859-1"),"UTF-8");
		} catch (UnsupportedEncodingException e) {
		}
		System.out.println("name=" + name);
		request.setAttribute("result", name);
		return "annotation";
	}

这样解决未免太过复杂．

还有一种方式，通过在web.xml添加一个过滤器，对所有传递的数据进行一次编码转换

    
    Character Encoding    
    org.springframework.web.filter.CharacterEncodingFilter    
        
        encoding    
        UTF-8    
        
    
    
    Character Encoding    
    /*    
  

这是spirngmvc自带的过滤器．

又在网上看到更好的方式解决这个问题，如果还在web.xml中加入过滤器，那请求就被拦截了两次，不太好，可以合并成一个拦截．

继承DispactcherServlet，修改编码方式：

package com.skymr.mvc;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.DispatcherServlet;

public class EncodingDispatcherServlet extends DispatcherServlet{

	protected String encoding;
	
	@Override
	protected void doService(HttpServletRequest request,
			HttpServletResponse response) throws Exception {
		request.setCharacterEncoding(encoding);
		super.doService(request, response);
	}

	@Override
	public void init(ServletConfig config) throws ServletException {
		encoding = config.getInitParameter("encoding");
		super.init(config);
	}

}

将web.xml中的springmvc的servlet改这个servlet，并设置参数encoding 为utf-8

      
        springMVC  
        com.skymr.mvc.EncodingDispatcherServlet  
        
        	contextConfigLocation
        	classpath*:/config/spring_annotation-servlet.xml
        
        
        	encoding
        	UTF-8
        
        1  
      
      
        springMVC  
        /  
      

６.传递实体数据

实体类

package com.skymr.mvc.entity;

public class User {

	private String name;
	
	private int age;

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}
	
	
}

Controller类修改

	@RequestMapping("/addUser")
	public String addUser(User user, HttpServletRequest request){
		request.setAttribute("result", "addUser-----");
		System.out.println("name=" + user.getName());
		request.setAttribute("user", user);
		return "annotation";
	}

显示

	
spring mvc学习笔记之数据传递

	

		${user.name },${user.age }