解决中文件乱码

一：使用过滤器解决网get/post请求的乱码

1：过滤器

package com.chinacache.utils;
import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;
//解决get和post请求的编码问题
public class CharacterFilter implements Filter {

	public void destroy() {

	}

	public void doFilter(ServletRequest req, ServletResponse resp,
			FilterChain chain) throws IOException, ServletException {
		HttpServletRequest request = (HttpServletRequest)req;//Tomcat
		HttpServletResponse response = (HttpServletResponse)resp;//Tomcat
		
		request.setCharacterEncoding("UTF-8");
		response.setContentType("text/html;charset=UTF-8");
		response.setCharacterEncoding("UTF-8");
		
		MyHttpServletRequest mrequest = new MyHttpServletRequest(request);
		chain.doFilter(mrequest, response);
	}

	public void init(FilterConfig filterConfig) throws ServletException {

	}

}
//1、实现与被增强对象共同的接口（或继承被增强对象）
//2、定义被增强对象的引用
//3、通过构造方法接收被增强对象
//4、修改需要被增强的方法
//5、不需要增强的方法，调用原对象的对应方法
class MyHttpServletRequest extends HttpServletRequestWrapper{
	private HttpServletRequest request;
	public MyHttpServletRequest(HttpServletRequest request){
		super(request);
		this.request = request;
	}
	public String getParameter(String name) {
		try{
			String value = request.getParameter(name);
			if(value==null)
				return value;
			//get方式才需要增强
			String method = request.getMethod();//请求方式：get post
			if("get".equalsIgnoreCase(method)){
				value = new String(value.getBytes("ISO-8859-1"),request.getCharacterEncoding());
			}
			return value;
		}catch(Exception e){
			throw new RuntimeException(e);
		}
	}
	
	
}

 

2：web.xml

<filter>
		<filter-name>CharacterFilter</filter-name>
		<filter-class>com.chinacache.utils.CharacterFilter</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>CharacterFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>

 二：如果使用spring mvc 的注解@ResponseBody  直接返回中文字符串会出现 "??????" 乱码

解决：

方法1：使用ajax请求时设置返回类型，返回json,xml可以正常显示中文

 

$.ajax({
　　type:'get',//可选get
　　url:'${projectPath}/execrevokesucceedrecord.json',       //.json   .xml
　　data:{"id":id} ,
　　dataType:'text',//服务器返回的数据类型 可选XML ,Json jsonp script htmltext等
　　success:function(msg){

},
　　error:function(){
}
})

 

方法2：不返回string  

参考：http://blog.youkuaiyun.com/hurryjiang/article/details/7710110

 

二：img 标签的  src 中存在乱码（http://localhost:8081/starscream/resources/images/bigUser/type_2__%E6%99%BA%E8%83%BD%E4%B8%8B%E8%BD%BD%E6%9C%8D%E5%8A%A1.jpg）

过滤器设置（我的图片在resources目录下）

		if (hr.getRequestURI().contains("resources")) {
			String uri = hr.getRequestURI();
			String ch = URLDecoder.decode(uri, "UTF-8");
			if (uri.equals(ch)) {
				chain.doFilter(request, response);
			} else {
				ch = ch.substring(hr.getContextPath().length());
				config.getServletContext().getRequestDispatcher(ch).forward(request, response);
			}
		}

js页面中的使用：url=encodeURI(url);

 参拷（http://bbs.youkuaiyun.com/topics/290057574）

package com.test;

import java.io.IOException;
import java.net.URLDecoder;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;

public class UrlFilter implements Filter {

    public final static String DEFAULT_URI_ENCODE = "UTF-8";
    
    private FilterConfig config = null;
    private String encode = null;
    
    @Override
    public void init(FilterConfig config) throws ServletException {
        this.config = config;
        this.encode = config.getInitParameter("DEFAULT_URI_ENCODE");
        if(this.encode == null) {
            this.encode = DEFAULT_URI_ENCODE;
        }
    }

    @Override
    public void doFilter(ServletRequest req, ServletResponse res,
            FilterChain chain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) req;
        String uri = request.getRequestURI();
        String ch = URLDecoder.decode(uri, encode);
        if(uri.equals(ch)) {
            chain.doFilter(req, res);
            return;
        }
        ch = ch.substring(request.getContextPath().length());
        config.getServletContext().getRequestDispatcher(ch).forward(req, res);
    }    

    @Override
    public void destroy() {
        config = null;
    }
}

 web.xml

  <filter>
    <filter-name>urlFilter</filter-name>
    <filter-class>com.test.UrlFilter</filter-class>
    <init-param>
      <param-name>DEFAULT_URI_ENCODE</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>urlFilter</filter-name>
    <url-pattern>/*.jpg</url-pattern>
  </filter-mapping>