無語了都，整了好久，網上各種答案，幾乎都是不行的，在apache的官網和一件網友的資料，現在OK了，分享如下：

這個原因是伺服器導致的，伺服器比如tomcat接收get方法預設使用的是ISO-8859-1編碼，而瀏覽器傳送時文字編碼是和頁面編碼保持一致的，如果頁面是使用utf-8 編碼 get方法文字自然是使用utf-8編碼，但接收伺服器沒有設定的情況下用了ISO-8859-1編碼接收，中文自然就成亂碼了，不過由於ISO-8859-1編碼是單位元組編碼所以我們可以使用getBytes("ISO-8859-1"),"utf-8"這樣把文字重新轉換成utf-8 編碼。
第一個傳送的文字是utf-8編碼 而tomcat接收後用錯誤的ISO-8859-1編碼了，這樣getBytes("ISO-8859-1"）後會重新得到正確的utf-8編碼的位元組陣列 ，然後用 new 
String(request.getParameter("something").getBytes("ISO-8859-1"),"utf-8")重新將位元組編碼成UTF-8編碼的文字這樣文字就正確了。

如果是tomcat的話 server.xml檔案裡
<Connector port="80" protocol="HTTP/1.1"
 connectionTimeout="20000"  redirectPort="8443" URIEncoding="UTF-8"/>
後邊的URIEncoding就是設定get方法編碼的如果沒有指定URL接收的編碼型別，自動會用ISO-8859-1編碼
 

示例程式碼如下：

/*
 * ====================================================================
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */

package test;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;

/**
 * This example demonstrates how to abort an HTTP method before its normal completion.
 */
public class ClientAbortMethod {

    public final static void main(String[] args) throws Exception {
    	 //post();
    		get();
    }
    
    public static void get()
    {
    	 CloseableHttpClient httpclient = HttpClients.createDefault();
         try {
         	String strUrl = "http://127.0.0.1:8080/Test/servlet/GetTest?info=";
         	String strParam = URLEncoder.encode("你好", "utf-8");
         	strUrl += strParam;
         	HttpGet httpget = new HttpGet(strUrl);
             System.out.println("Executing request " + httpget.getURI());
             CloseableHttpResponse response = httpclient.execute(httpget);
             try {
             	String strInfo = EntityUtils.toString(response.getEntity());
             	System.out.println(strInfo);
                 httpget.abort();
             } finally {
                 response.close();
             }
         } catch(Exception e)
         {
        	 e.printStackTrace();
         }
         finally {
             try {
				httpclient.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
         }
    }
    public static void post()
    {
    	try {
			DefaultHttpClient httpclient = new DefaultHttpClient();
			HttpResponse response;
			HttpEntity entity;
			HttpPost httpost = new HttpPost("http://127.0.0.1:8080/Test/servlet/GetTest");
			List <NameValuePair> nvps = new ArrayList <NameValuePair>();
			nvps.add(new BasicNameValuePair("info", "kaxu中文"));
			nvps.add(new BasicNameValuePair("password", "kaxu"));
			httpost.setEntity(new UrlEncodedFormEntity(nvps, HTTP.UTF_8));
			response = httpclient.execute(httpost);
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		} catch (ClientProtocolException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
    }

}
 

服務端的程式碼如下：

package com.neusoft;

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

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

public class GetTest extends HttpServlet {

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html;charset=utf-8");

		PrintWriter out = response.getWriter();
		String info = new String(request.getParameter("info").getBytes("ISO-8859-1"),"utf-8");
		System.out.println(info);
		
		out.flush();
		out.close();
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html");
		PrintWriter out = response.getWriter();
		request.setCharacterEncoding("utf-8");
		String strInfo = request.getParameter("info");
		String str1 = URLDecoder.decode(strInfo, "utf-8");
		System.out.println(str1);
		
		out.flush();
		out.close();
	}

}