android:HttpClient请求（get、post）

本文主要介绍android如何通过HttpClient请求服务器端的内容

一：服务器端代码准备

web.xml配置文件

<?xml version="1.0" encoding="ISO-8859-1"?>          androidweb        androidweb           login      com.smart.androidweb.servlet.LoginServlet                 login        /login                index.html        index.xhtml        index.htm        index.jsp

2.Servlet代码准备LoginServlet.java

package com.smart.androidweb.servlet;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class LoginServlet extends HttpServlet {/** *  */private static final long serialVersionUID = 1L;@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException {// TODO Auto-generated method stub//在网上很有效的解决方法是添加：resp.setCharacterEncoding("UTF-8");//解决不了，后来又搜到一条解决方法是：resp.setHeader("content-type","text/html;charset=UTF-8");String username = req.getParameter("username");String password = req.getParameter("password");PrintWriter writer = resp.getWriter();if("".equals(username) || username == null) {writer.print("用户名不能为空!");return ;}if("".equals(password) || password == null) {writer.print("密码不能为空");return ;}if("testname".equals(username) && "123456".equals(password)) {writer.print("登陆成功");} else {writer.print("登陆失败");}}@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp)throws ServletException, IOException {// TODO Auto-generated method stub//resp.setreqdoGet(req, resp);}}

二：android端代码准备 1）不要忘记在清单文件中添加网络访问权限

<uses-permission android:name="android.permission.INTERNET">uses-permission>

 2）android开发工具倒入一下两个jar包(没有的可以在网络上搜索下载一下)

httpclient-4.0.1.jar,httpcore-4.0.1.jar

 3）布局文件

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>

4）java端代码

MainActivity.java

package com.smart.httpclient.activity;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.EditText;import android.widget.Toast;import org.apache.http.HttpResponse;import org.apache.http.NameValuePair;import org.apache.http.client.entity.UrlEncodedFormEntity;import org.apache.http.client.methods.HttpGet;import org.apache.http.client.methods.HttpPost;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.message.BasicNameValuePair;import org.apache.http.util.EntityUtils;import java.io.IOException;import java.util.ArrayList;import java.util.List;public class MainActivity extends AppCompatActivity {    EditText et_username;    EditText et_password;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        et_username = (EditText)findViewById(R.id.et_username);        et_password = (EditText)findViewById(R.id.et_password);    }    public void onClick(View v) {        if(v.getId() == R.id.bt_cannel) {           loginPost();        } else  if(v.getId() == R.id.bt_submit) {            loginGet();        }    }    /**     * GET方式请求数据     */    public void loginGet() {        new Thread(new Runnable() {            @Override            public void run() {                String username = et_username.getText().toString().trim();                String password = et_password.getText().toString().trim();                //网络请求地址                String urlPath = "http://192.168.1.6:8080/androidweb/login?username="+username+"&password="+password;                //创建客户端请求对象                DefaultHttpClient client = new DefaultHttpClient();                //以GET的方式进行请求                HttpGet get = new HttpGet(urlPath);                try {                    //获取服务器响应对象                    HttpResponse response = client.execute(get);                    //获取请求码200正确，404网址不存在，500服务器程序错误                    int code = response.getStatusLine().getStatusCode();                    if(code == 200) {                       // 功过工具类把response的输出流转换成字符串                        String content = EntityUtils.toString(response.getEntity(),"utf-8");                        //显示获取的内容                        showToast(content);                    }                } catch (IOException e) {                    e.printStackTrace();                }            }        }).start();    }    /**     * Post方式请求数据，为安全起见都用post     */    public void loginPost() {        new Thread(new Runnable() {            @Override            public void run() {                String username = et_username.getText().toString().trim();                String password = et_password.getText().toString().trim();                //网络请求地址                String urlPath = "http://192.168.1.6:8080/androidweb/login";//?username="+username+"&password="+password;                //创建客户端请求对象                DefaultHttpClient client = new DefaultHttpClient();                //以Post的方式进行请求                HttpPost post = new HttpPost(urlPath);                //封装http求取参数                List params = new ArrayList();                NameValuePair pairun = new BasicNameValuePair("username",username);                NameValuePair pairpw = new BasicNameValuePair("password",password);                params.add(pairun);                params.add(pairpw);                try {                    //组装请求内容                    UrlEncodedFormEntity entity = new UrlEncodedFormEntity(params);                    //设置请求参数                    post.setEntity(entity);                    //获取服务器响应对象                    HttpResponse response = client.execute(post);                    //获取请求码200正确，404网址不存在，500服务器程序错误                    int code = response.getStatusLine().getStatusCode();                    if(code == 200) {                        // 功过工具类把response的输出流转换成字符串                        String content = EntityUtils.toString(response.getEntity(),"utf-8");                        //显示获取的内容                        showToast(content);                    }                } catch (Exception e) {                    e.printStackTrace();                }            }        }).start();    }    /**     * 封装吐司方法，使其在任意位置都可显示。     * @param content     */    public void showToast(final String content) {        runOnUiThread(new Runnable() {            @Override            public void run() {                Toast.makeText(getApplicationContext(),content,Toast.LENGTH_LONG).show();            }        });    }}

一：服务器端代码准备

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