jsp 页面传值 到后台 中文乱码解决方法

例jsp中传入的参数名字：shortname

情况（1）：和方法2针对的情况一样 如果是第3种情况的话就不适用了

                     java后台代码这样处理   String str = new String(shortname.getBytes("iso-8859-1"),"UTF-8") ; 不需要对jsp页面的参数编码

情况（2）针对使用Ajax get请求时参数不附加在url后：如 $.ajax{type:get,data:shortname:shortname......  }

                 jsp页面参数这样处理 encodeURIComponent(shortname)

          java后台代码这样处理    String str = URLDecoder.decode(shortname, "utf-8");

情况（3）get 提交针对于参数附加在url后面:如：url:/ajax/a.action?shortname=shortname

                     jsp页面参数这样处理 encodeURI((encodeURI(shortname)))    这样也可以encodeURI(shortname)  。。。。。

                    java后台代码这样处理  String str = URLDecoder.decode(shortname, "utf-8");

针对第2和第3种情况  如果前台还需要这个参数shortname  一直在前后台传来传去的话，要注意下 后台传到前台时也要对这个参数shortname进行编码：

URLEncoder.encode(URLEncoder.encode(shortname, "utf-8"), "utf-8")  还有就是情况2,3避免乱码，可以改用post请求！

不过感觉最简单的方法还是用过滤器了:过滤器类如下

package zz;


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;

/**
 * Filter that sets the character encoding to be used in parsing the
 * incoming request
 */
public class SetCharacterEncodingFilter implements Filter {
	protected String encoding = null;
    protected FilterConfig filterConfig = null;
    public void destroy() {}
    public void init(FilterConfig filterConfig) throws ServletException {
    	this.filterConfig = filterConfig;
        this.encoding = filterConfig.getInitParameter("encoding");
    }
    /**
     * Select and set(if specified) the character encoding to be used to
     * interpret request parameters for this request
     */
    public void doFilter(ServletRequest request,ServletResponse response,
                          FilterChain chain) throws IOException,ServletException {
        request.setCharacterEncoding(encoding);
        response.setCharacterEncoding(encoding);
        
        chain.doFilter(request,response);
    }
}

web.xml中的配置加上下面几句话就行了：

<filter>
    <filter-name>SetCharacterEncoding</filter-name>
    <filter-class>com.bigdata.financial.filter.SetCharacterEncodingFilter</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
  </filter>
  
  <filter-mapping>
    <filter-name>SetCharacterEncoding</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>