http网络通信--页面源代码查看

1.要在andorid中实现网络图片查看，涉及到用户隐私问题，所以要在AndroidManifest.xml中添加访问网络权限

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

2.布局文件

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:orientation="vertical" >

 

    <EditText

        android:id="@+id/path"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="http://10.162.0.171:8080/html/index.jsp"

         />

     <Button

        android:id="@+id/button"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="查看"

        android:onClick="onClick"

         />

     <ScrollView

         android:layout_width="fill_parent"

         android:layout_height="fill_parent"

         >

           <TextView 

             android:id="@+id/text"

             android:layout_width="fill_parent"

             android:layout_height="fill_parent"     

             />

     </ScrollView>

 

</LinearLayout>

3.MainActivity.java

package com.example.html;

import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

import org.apache.http.HttpConnection;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.app.Activity;
import android.text.TextUtils;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {
	private EditText path;
	private TextView text;
	private final int SUCCESS=1;
	private final int ERROR=2;
	
	/**
	 * 主线程创建消息处理器
	 */
	private Handler handler = new Handler(){

		@Override
		public void handleMessage(Message msg) {
			if(msg.what==SUCCESS){
				String showhtml =(String) msg.obj;
				text.setText(showhtml);
			}else if(msg.what==ERROR){
				Toast.makeText(MainActivity.this, "html加载失败", Toast.LENGTH_LONG).show();
			}
		}
		
	};

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		path = (EditText) findViewById(R.id.path);
		text = (TextView) findViewById(R.id.text);
	}

	public void onClick(View view) {
		final String textPath = path.getText().toString();
		if(!TextUtils.isEmpty(textPath)){
			new Thread(){

				@Override
				public void run() {
					try {
						URL url = new URL(textPath);
						
						int code = conn.getResponseCode();
						if(code==200){
							InputStream is = conn.getInputStream();
							String s=StreamService.getInputStream(is);
							
							Message msg = new Message();
							msg.what=SUCCESS;
							msg.obj=s;
							handler.sendMessage(msg);
						}else{
							System.out.println("code"+code);
							InputStream is = conn.getInputStream();
							String s=StreamService.getInputStream(is);
							System.out.print(s);
							Message msg = new Message();
							msg.what=ERROR;
							handler.sendMessage(msg);
						}
					} catch (Exception e) {
						// TODO Auto-generated catch block
						System.out.println("textPath"+textPath);
						e.printStackTrace();
						Message msg = new Message();
						msg.what=ERROR;
						handler.sendMessage(msg);
					}
				}
				
			}.start();
		}else{
			Toast.makeText(MainActivity.this, "访问路径不能为空", Toast.LENGTH_LONG).show();
		}
	}

}

4.StreamService.java

package com.example.html;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

public class StreamService {
	public static String getInputStream(InputStream iSteam) throws IOException{
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		byte[] buffer = new byte[1024];
		int len=0;
		if((len=iSteam.read(buffer))!=-1){ //把InputStream读入到内存当做
			baos.write(buffer, 0, len); //写入内存
		}
		iSteam.close();
		baos.close();
		byte[] result=baos.toByteArray();
		String html = new String(result, "utf-8");
		return html;
	}

}

以上毫无疑问地成功，细心地我们发现，如果把index.jsp的编码改为gbk，gb2312等等的字符编码，上面的代码会显示成功的界面吗？



经过验证，把index.jsp的编码改为gbk，gb2312。结果是：





Android界面中出现了乱码。



原因在于：



public class StreamService {

public static String getInputStream(InputStream iSteam) throws IOException{

ByteArrayOutputStream baos = new ByteArrayOutputStream();

byte[] buffer = new byte[1024];

int len=0;

if((len=iSteam.read(buffer))!=-1){ //把InputStream读入到内存当做

baos.write(buffer, 0, len); //写入内存

}

iSteam.close();

baos.close();

byte[] result=baos.toByteArray();

String html = new String(result, "utf-8");

return html;

}

我们得到字节result后，转化为字符串的字符是utf-8。

String temp = new String(result);在这方法中android系统默认的字符为utf-8



如何index.jsp中的编码是gbk，gb2312，并且返回的字符串也没有设定编码。这样就会与android默认返回的编码utf-8冲突，所以出现乱码



解决字符串编码问题



修改StreamService.java

package com.example.html;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

public class StreamService {
	public static String getInputStream(InputStream iSteam) throws IOException{
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		byte[] buffer = new byte[1024];
		int len=0;
		if((len=iSteam.read(buffer))!=-1){ //把InputStream读入到内存当做
			baos.write(buffer, 0, len); //写入内存
		}
		iSteam.close();
		baos.close();
		byte[] result=baos.toByteArray();
		//解决中文乱码
		//解析result里面的字符串   
		String temp = new String(result);
		if(temp.contains("utf-8")){ //编码为utf-8时，直接返回字符串
			return temp;
		}else if(temp.contains("gbk")){  //如果不是utf-8，则设置返回的编码
			String html = new String(result, "gbk");
			return html;
		}else if(temp.contains("gb3212")){
			String html = new String(result, "gb3212");
			return html;
		}
		return temp;
		
	}

}

修改后结果：