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：
