java搭建本地服务器，android客户端访问，tomcat详细步骤

代码都在这里，先可以不用下这个，跟着下面先把环境搭好，出问题再来看代码：

https://download.csdn.net/download/qq_31939617/10275515

eclispe64位，直接解压就可以用

https://pan.baidu.com/s/1nwv1JM5

jdk配置就自行百度吧

Tomcat安装：

1.任意打开一个浏览器，搜索tomcat。在结果列表中打开tomcat官网。

https://tomcat.apache.org/download-80.cgi

往下拉，找到8.0版本的（最好是用为0的版本，6.0/7.0/8.0，刚开始时候装了个8.5.28版本，在后面eclispe配置出现问题了）

2.安装版本的，点击安装

3.选择jre位置（jdk先装了吧）

4.选择安装位置

5.安装完成了

6.安装版有3种启动服务的方法。

一是打开bin目录下的Tomcat8w.exe；

二是计算机——>管理——>服务（管理tomcat的服务）；

三是通过任务栏上的tomcat启动图标管理tomcat的启动和暂停

启动成功

7.在浏览器输入：http://localhost:8080/,出现这个页面Tomcat安装就完成了

下面为eclipse配置tomcat

1.打开eclipse--Windows--Preferences，选择

2.选择tomcat版本，我安装的是8.0的

3.选择tomcat，jre路径

创建项目：

1.运行Eclipse，Java EE模式下： File--New--Dynamic Web project

新建Te，

2.项目新建完成，自行导入servlet库（项目属性－>Build Path->add Libraries），安装了tomact也有这个。

都放这了，包括mysql,json的

https://download.csdn.net/download/qq_31939617/10274249

放到lib里面，别忘了右键Buil path--Add to Buil path

2.在src下新䢖abc包，下面新建Test.class

package abc;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.LinkedHashMap;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import net.sf.json.JSONObject;

public class Test extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        Map map = new LinkedHashMap();
        map.put("code", "200");
        map.put("msg", "");
        
        Map map1 = new LinkedHashMap();
        map1.put("version", "2.1.0");
        map1.put("describe", "1.优化网络加载速度");
        map.put("data", map1);

        // 无参请求
        request.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();

        JSONObject obj = JSONObject.fromObject(map);
        out.write(obj.toString());
        return;
    }
    
    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }

}

3.在根目录WEB-INF/web.xml,

配置web.xml

<?xml version="1.0" encoding="UTF-8"?>
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee  
    http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd">

    
        test
        abc.Test
    

    
        test
        /abc_test
    

服务端完成

三，创建android项目

1.创建Test项目：

使用android stduio 创建简单的工程。访问上面创建的servlet，如果是真机，需要改localhost为pc的IP地址。
别忘了权限：

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

清单文件：AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.sz.test">    android:name="android.permission.INTERNET"/>            android:allowBackup="true"        android:icon="@mipmap/ic_launcher"        android:label="@string/app_name"        android:roundIcon="@mipmap/ic_launcher_round"        android:supportsRtl="true"        android:theme="@style/AppTheme">        android:name=".MainActivity">                            android:name="android.intent.action.MAIN" />                android:name="android.intent.category.LAUNCHER" />                        

布局文件：activity_main.xml可以复制：

<?xml version="1.0" encoding="utf-8"?>xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:gravity="center"    android:orientation="vertical"    tools:context="com.example.sz.test.MainActivity">            android:id="@+id/btn"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="center"        android:text="测试"        app:layout_constraintBottom_toBottomOf="parent"        app:layout_constraintLeft_toLeftOf="parent"        app:layout_constraintRight_toRightOf="parent"        app:layout_constraintTop_toTopOf="parent" />            android:id="@+id/tv"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="center"        android:layout_marginTop="20dp"        android:text="测试"        app:layout_constraintBottom_toBottomOf="parent"        app:layout_constraintLeft_toLeftOf="parent"        app:layout_constraintRight_toRightOf="parent"        app:layout_constraintTop_toTopOf="parent" />

MainAcitvity.class可以复制：

package com.example.sz.test;import android.os.Handler;import android.os.Message;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.TextView;import android.widget.Toast;import org.json.JSONObject;import java.io.InputStream;import java.io.OutputStream;import java.net.HttpURLConnection;import java.net.URL;import java.util.HashMap;import java.util.Map;public class MainActivity extends AppCompatActivity {    private static final String TAG = "MainActivity";    TextView tv;    Button btn;    public static final int MSG_CODE = 1;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        tv = findViewById(R.id.tv);        btn = findViewById(R.id.btn);        btn.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                final Map, Object> map = new HashMap<>();                //map.put("mobile", phone);                String url = "http://192.168.1.194:8080/Te/abc_test";                HttpClientUtil.postRequestNetwork(url, map, false, new HttpClientUtil.HttpClientCallbackListener() {                    @Override                    public void onSuccess(String response) {                        Log.e(TAG, "onSuccess: -------------" + response);                        // {"code":"200","msg":"","data":{"version":"2.0.1","describe", "1.优化网络加载速度"}}                        JSONObject jsonObject1 = null;                        JSONObject jsonObject2 = null;                        Log.e(TAG, "onSuccess: --response--" + response);                        //json解析取出返回值                        try {                            jsonObject1 = new JSONObject(response);                            int code = jsonObject1.getInt("code");                            jsonObject2 = jsonObject1.getJSONObject("data");                            String version = jsonObject2.getString("version");                            String describe = jsonObject2.getString("describe");                            Message message = new Message();                            message.what = MSG_CODE;                            Bundle bundle = new Bundle();                            bundle.putInt("code", code);                            bundle.putString("version", version);                            bundle.putString("describe", describe);                            message.setData(bundle);                            mHandler.sendMessage(message);                        } catch (Exception e) {                            e.printStackTrace();                            Log.e(TAG, "onSuccess: --e---" + e);                        }                    }                    @Override                    public void onFailure(Exception e) {                        Log.e(TAG, "onFailure: -----e------" + e);                    }                });            }        });    }    private Handler mHandler = new Handler() {        @Override        public void handleMessage(Message msg) {            switch (msg.what) {                case MSG_CODE:                    int code = msg.getData().getInt("code");                    String version = msg.getData().getString("version");//读出数据                    String describe = msg.getData().getString("describe");//读出数据                    if (code == 200) {                        tv.setText("code:"+code + "version:"+version +"describe:"+ describe);                    }                    break;                default:                    break;            }        }    };}

HttpClientUtil.class可以复制：

package com.example.sz.test;import android.util.Log;import org.apache.http.HttpResponse;import org.apache.http.client.HttpClient;import org.apache.http.client.methods.HttpGet;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.util.EntityUtils;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.io.OutputStream;import java.io.OutputStreamWriter;import java.net.HttpURLConnection;import java.net.URL;import java.util.Map;/** * Created by ThinkPad on 2017/8/20. * HttpClientUtil工具类 * lib下导入org.apache.http.legacy.jar */public class HttpClientUtil {    private static final String TAG = "HttpClientUtil";    private static String response = "";    //get请求服务器    public static void getRequestNetwork(final String urlPath, final HttpClientCallbackListener listener) {        new Thread(new Runnable() {            @Override            public void run() {                try {                    HttpGet getMethod = new HttpGet(urlPath);//将URL与参数拼接                    HttpClient httpClient = new DefaultHttpClient();                    HttpResponse mHttpResponse = httpClient.execute(getMethod); //发起GET请求                    int code = mHttpResponse.getStatusLine().getStatusCode();                    if (code == 200) {                        response = EntityUtils.toString(mHttpResponse.getEntity(), "utf-8");                        Log.e(TAG, "getRequestNetwork:---- " + response);                        if (listener != null) {                            listener.onSuccess(response.toString());                        }                    }                } catch (IOException e) {                    e.printStackTrace();                    if (listener != null) {                        listener.onFailure(e);                    }                }            }        }).start();    }    /**     * 通过post请求服务器     *     * @param url     * @param params   参数     * @param skipNull 是否跳过NULL值，true则不发送value=null的key，否则发送value=     *                 需要导入lib中的jar包     */    public static void postRequestNetwork(final String url, final Map, Object> params, final boolean skipNull, final HttpClientCallbackListener listener) {        new Thread(new Runnable() {            @Override            public void run() {                OutputStreamWriter out = null;                BufferedReader in = null;                StringBuilder connResult = new StringBuilder("");                String fullUrl = "";                try {                    StringBuilder builder = new StringBuilder();                    if (null != params && params.size() > 0) {                        for (String s : params.keySet()) {                            if (null == params.get(s)) {                                if (!skipNull) {                                    builder.append(s).append("=").append("&");                                }                                continue;                            }                            if (params.get(s) instanceof Iterable<?>) {                                Iterable<?> ite = (Iterable<?>) params.get(s);                                for (Object i : ite) {                                    builder.append(s).append("=").append(i).append("&");                                }                            } else {                                builder.append(s).append("=").append(params.get(s)).append("&");                            }                        }                        builder.delete(builder.length() - 1, builder.length());                    }                    fullUrl = url + "?" + builder.toString();                    //  log.debug(String.format("http request %s", fullUrl));                    URL destURL = new URL(url);                    HttpURLConnection urlConn = (HttpURLConnection) destURL.openConnection();                    urlConn.setConnectTimeout(5000);                    urlConn.setReadTimeout(40000);                    urlConn.setDoOutput(true);                    urlConn.setDoInput(true);                    urlConn.setAllowUserInteraction(false);                    urlConn.setUseCaches(false);                    urlConn.setRequestMethod("POST");                    OutputStream oups = urlConn.getOutputStream();                    oups.write(builder.toString().getBytes());                    urlConn.connect();                    // 响应编码                    String contentType = urlConn.getHeaderField("Content-Type");                    String encode = "UTF-8";                    int index = -1;                    if (null != contentType && (index = contentType.indexOf("charset=")) > -1) {                        encode = contentType.substring(index + 8);                    }                    // 返回状态码                    int state = urlConn.getResponseCode();                    if (state < 400) {// 返回状态码<400为正确响应                        in = new BufferedReader(new InputStreamReader(urlConn.getInputStream(), encode));                    } else {                        in = new BufferedReader(new InputStreamReader(urlConn.getErrorStream(), encode));                    }                    String s = null;                    while ((s = in.readLine()) != null) {                        connResult.append(s);                    }                    // log.debug(String.format("http request %s, response[code:%d, encode:%s, content:%s]", fullUrl, state,                    // encode, connResult.toString()));                    if (listener != null) {                        listener.onSuccess(connResult.toString());                    }                } catch (IOException e) {                    e.printStackTrace();                    //  log.error("http request[" + fullUrl + "] error", e);                    if (listener != null) {                        listener.onFailure(e);                    }                } finally {                    try {                        if (out != null) {                            out.close();                            if (in != null) {                                in.close();                            }                        }                    } catch (IOException e) {                        e.printStackTrace();                    }                }            }        }).start();    }    public interface HttpClientCallbackListener {        void onSuccess(String response);        void onFailure(Exception e);    }}

记着引入httpClient

真机测试 ，一定要在同一局域网内，要把这个地址换成自己的

成功

代码都在这里：

https://download.csdn.net/download/qq_31939617/10275515

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