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j2me中的page编码转化

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作者:cleverpig(作者的Blog:http://blog.matrix.org.cn/page/cleverpig)

原文:http://www.matrix.org.cn/resource/article/44/44154_j2me.html

关键字:j2me,页面,编码,乱码

一、择要

根据xinshouj2me在j2me版提出的“httpconnection收集连接的问题”,本人阐发了一下:因为www.163.com上的页面编码为gb2312,以是应用utf8读取因为编码要领不合会获得乱码。于是本人根据page的编码机动进行编码转化,在此与大年夜家共享、评论争论。

二、代码阐发

1.HttpConnectionHandler接口类

最好根据page的编码机动进行编码转化,于是本人定义了一个HttpConnectionHandler接口类:

HttpConnectionHandler.java

package com.bjinfotech.practice.j2me.httpConnection;

import java.util.Hashtable;

import javax.microedition.io.HttpConnection;

/**

* Http连接处置惩罚器接口

* @author cleverpig

*

*/

public interface HttpConnectionHandler {

//http哀求常量

public static final String RQH_HOST="X-Online-Host";

public static final String RQH_ACCEPT="Accept";

public static final String RQH_CONTENT_LANGUAGE="Content-Language";

public static final String RQH_CONTENT_TYPE="Content-Type";

public static final String RQH_CONNECTION_OPTION="Connection";

//http回应常量

public static final String RSH_DATE="Date";

public static final String RSH_SERVER="Server";

public static final String RSH_MODIFIEDDATE="Last-Modified";

public static final String RSH_CONTENT_ENCODING="Content-Encoding";

public static final String RSH_CONTENT_LENGTH="Content-Length";

public static final String RSH_CONTENT_TYPE="Content-Type";

public boolean putRequestHeaderProperty(

HttpConnection conn,

String key,

String keyValue);

public String getResponseHeaderProperty(

HttpConnection conn,

String key);

public boolean setRequestMethod(

HttpConnection conn,

String methodName);

public boolean putRequestHeader(

HttpConnection conn,

Hashtable propertiesPair);

public Hashtable getResponseHeader(

HttpConnection conn,

String[] propertyNames);

public boolean sendRequestData(

HttpConnection conn,

Object sendData);

public Object getResponseData(HttpConnection conn);

}

2.HTML_HttpConnectionHandlerImpl类

根据HttpConnectionHandler接口规范实现了该接口——HTML_HttpConnectionHandlerImpl类。

HTML_HttpConnectionHandlerImpl.java

package com.bjinfotech.practice.j2me.httpConnection;

import java.io.DataOutputStream;

import java.io.DataInputStream;

import java.util.Hashtable;

import java.util.Vector;

import java.util.Enumeration;

import javax.microedition.io.HttpConnection;

/**

* http连接处置惩罚器实现

* @author cleverpig

*

*/

public class HTML_HttpConnectionHandlerImpl implements HttpConnectionHandler{

private String message="";

public HTML_HttpConnectionHandlerImpl(){

}

public boolean putRequestHeaderProperty(

HttpConnection conn,

String key,

String keyValue){

message="";

try{

conn.setRequestProperty(key,keyValue);

return true;

}

catch(Exception ex){

message=ex.getMessage();

}

return false;

}

public String getResponseHeaderProperty(

HttpConnection conn,

String key){

return conn.getRequestProperty(key);

}

public boolean putRequestHeader(

HttpConnection conn,

Hashtable propertiesPair){

Enumeration keyEnumer=propertiesPair.keys();

boolean result=true;

while(keyEnumer.hasMoreElements()){

String keyName=(String)keyEnumer.nextElement();

String keyValue=(String)propertiesPair.get(keyName);

if (putRequestHeaderProperty(conn,keyName,keyValue)==false){

result=false;

}

}

return result;

}

public boolean setRequestMethod(

HttpConnection conn,

String methodName){

message="";

try{

conn.setRequestMethod(methodName);

return true;

}

catch(Exception ex){

message=ex.getMessage();

return false;

}

}

public Hashtable getResponseHeader(

HttpConnection conn,

String[] propertyNames){

Hashtable result=new Hashtable();

for(int i=0;i

String keyValue=conn.getRequestProperty(propertyNames[i]);

result.put(propertyNames[i],keyValue);

}

return result;

}

public boolean sendRequestData(

HttpConnection conn,

Object sendData){

message="";

try{

DataOutputStream os=conn.openDataOutputStream();

os.writeUTF((String)(sendData));

os.flush();

return true;

}

catch(Exception ex){

message=ex.getMessage();

return false;

}

}

public Object getResponseData(HttpConnection conn){

DataInputStream is=null;

message="";

try{

is=conn.openDataInputStream();

}

catch(Exception ex){

message=ex.getMessage();

return null;

}

byte[] data=null;

String type=getResponseHeaderProperty(conn,RSH_CONTENT_TYPE);

int len = 0;

try{

len=Integer.parseInt(getResponseHeaderProperty(conn,RSH_CONTENT_LENGTH));

}

catch(Exception ex){

len=0;

}

if (len > 0) {

int actual = 0;

int bytesread = 0 ;

data = new byte[len];

while ((bytesread != len) && (actual != -1)) {

try{

actual = is.read(data, bytesread, len - bytesread);

bytesread += actual;

}

catch(Exception ex){

message=ex.getMessage();

return null;

}

}

} else {

int ch;

Vector vbuffer=new Vector();

try{

while ((ch = is.read()) != -1) {

vbuffer.addElement(new Integer(ch));

}

}

catch(Exception ex){

message=ex.getMessage();

return null;

}

len=vbuffer.size();

data = new byte[len];

for(int i=0;i",flagBeginPosition);

if (flagEndPosition>flagBeginPosition){

type=result.substring(flagBeginPosition+"charset=".length(),flagEndPosition);

}

System.out.println("得到html字符集:"+type);

if (type!=null){

try{

result=new String(data,type);

}

catch(Exception ex){

message=ex.getMessage();

}

}

return result;

}

public String getMessage(){

return message;

}

}

上面实现类中根据page中的实际编码类型对html字符串进行了编码转化,这样就实现了page编码的机动转化。

虽然机动性加强了,然则对付内存的占用也随之增添了一倍。

三.测试代码

package com.bjinfotech.practice.j2me.httpConnection;

import javax.microedition.midlet.MIDlet;

import javax.microedition.midlet.MIDletStateChangeException;

import javax.microedition.io.HttpConnection;

import javax.microedition.io.Connector;

import java.util.Hashtable;

public class HttpConnectionMIDlet extends MIDlet {

public HttpConnectionMIDlet() {

super();

}

protected void startApp() throws MIDletStateChangeException {

HTML_HttpConnectionHandlerImpl handler=new HTML_HttpConnectionHandlerImpl();

try{

String host="10.11.3.99";

String url="http://10.11.3.99:8080/test_gbk.html";

//String url="http://10.11.3.99:8080/test_gb2312.html";

//String url="http://10.11.3.99:8080/test_utf8.html";

HttpConnection conn=(HttpConnection)Connector.open(url);

if (conn.getResponseCode()==HttpConnection.HTTP_OK){

System.out.println("建立连接成功");

Hashtable requestHeaderPair=new Hashtable();

requestHeaderPair.put(

HTML_HttpConnectionHandlerImpl.RQH_HOST,

host);

requestHeaderPair.put(

HTML_HttpConnectionHandlerImpl.RQH_CONTENT_TYPE,

"application/octet-stream");

requestHeaderPair.put(

HTML_HttpConnectionHandlerImpl.RQH_CONTENT_LANGUAGE,

"en-US");

requestHeaderPair.put(

HTML_HttpConnectionHandlerImpl.RQH_ACCEPT,

"application/octet-stream");

requestHeaderPair.put(

HTML_HttpConnectionHandlerImpl.RQH_CONNECTION_OPTION,

"Keep-Alive");

handler.putRequestHeader(conn,requestHeaderPair);

handler.setRequestMethod(conn,HttpConnection.GET);

handler.sendRequestData(conn,"GET / HTTP/1.1");

if (conn.getResponseCode()==HttpConnection.HTTP_OK){

System.out.println("发送哀求成功");

System.out.println("得到回应数据");

String reponseData=(String)handler.getResponseData(conn);

System.out.println(reponseData);

}

else{

System.out.println("发送哀求掉败");

System.out.println("差错信息:"+handler.getMessage());

}

}

else{

System.out.println("建立连接掉败");

}

}

catch(Exception ex){

System.out.println("差错信息:"+handler.getMessage());

ex.printStackTrace();

}

}

protected void pauseApp() {

}

protected void destroyApp(boolean arg0) throws MIDletStateChangeException {

}

}

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