A. java如何將字元串轉化為URL
將字元串轉換成URL可以使用創建一個URL對象，並將字元串賦給這個URL對象。
參考代碼如下：
String str = "填寫字元串的鏈接地址";
try {
URL url = new URL(str);
} catch (MalformedURLException e) {
e.printStackTrace();
}
注意，創建URL對象會有異常，所以使用try處理拋出的異常。
B. 用java做分頁時，如何獲取url
httpServletRequest.getRequestURI();
或者
string url = HttpContext.Current.Request.Url.ToString();
//獲取當前頁的URL
或者
設置參數 前台傳參：....&url=.... 後台接值： request.getParameter("url")
java 後台分頁 httpServletRequest.getRequestURI();
建議用AJAX，這樣可以不需要獲取 url
C. java獲取伺服器文件，怎樣用url返回
下面提供二種方法會使用java發送url請求，並獲取伺服器返回的值
第一種方法：
代碼如下:
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.params.CoreConnectionPNames;
import org.apache.http.util.EntityUtils;
(StringurlStr,Stringparam1,Stringparam2)throwsException{
StringtempStr=null;
HttpClienthttpclient=newDefaultHttpClient();
Propertiesproperties=newProperties();
HttpEntityentity=null;
StringxmlContent="";
try
{
//設置超時時間
httpclient.getParams().setIntParameter(CoreConnectionPNames.CONNECTION_TIMEOUT,20000);
httpclient.getParams().setParameter(CoreConnectionPNames.SO_TIMEOUT,20000);
//封裝需要傳遞的參數
List<NameValuePair>nvps=newArrayList<NameValuePair>();
nvps.add(newBasicNameValuePair("mainMemoCode",strmainMemoCode));
nvps.add(newBasicNameValuePair("recordPassWord",strrecordPassWord));
//客戶端的請求方法類型
HttpPosthttpPost=newHttpPost(urlStr);
httpPost.setEntity(newUrlEncodedFormEntity(nvps,"GBK"));
HttpResponseresponse=httpclient.execute(httpPost);
//獲取伺服器返回Http的Content-Type的值
tempStr=response.getHeaders("Content-Type")[0].getValue().toString();
//獲取伺服器返回頁面的值
entity=response.getEntity();
xmlContent=EntityUtils.toString(entity);
Stringstrmessage=null;
System.out.println(xmlContent);
System.out.println(response.getHeaders("Content-Type")[0].getValue().toString());
httpPost.abort();
}
catch(SocketTimeoutExceptione)
{
}
catch(Exceptionex)
{
ex.printStackTrace();
}
finally{
httpclient.getConnectionManager().shutdown();
}
第二種方法：
代碼如下:
(StringurlStr,Stringparam1,Stringparam2)throwsException{
HttpURLConnectionurl_con=null;
try{
URLurl=newURL(urlStr);
StringBufferbankXmlBuffer=newStringBuffer();
//創建URL連接，提交到數據，獲取返回結果
HttpURLConnectionconnection=(HttpURLConnection)url.openConnection();
connection.setRequestMethod("POST");
connection.setDoOutput(true);
connection.setRequestProperty("User-Agent","directclient");
PrintWriterout=newPrintWriter(newOutputStreamWriter(connection.getOutputStream(),"GBK"));
out.println(param);
out.close();
BufferedReaderin=newBufferedReader(newInputStreamReader(connection
.getInputStream(),"GBK"));
StringinputLine;
while((inputLine=in.readLine())!=null){
bankXmlBuffer.append(inputLine);
}
in.close();
tempStr=bankXmlBuffer.toString();
}
catch(Exceptione)
{
System.out.println("發送GET請求出現異常！"+e);
e.printStackTrace();
}finally{
if(url_con!=null)
url_con.disconnect();
}
returntmpeStr;
}
總結：多練習代碼，熟練之後才能更快速的去了解代碼的學習的方法。多去獲取一些思維方面的書籍可以看看。
D. JAVA URL類中的這個構造函數的參數是什麼意思
context是用來保存基路徑的，新建的URL的路徑會是context中的路徑和spec拼接起來的路徑。
比如
URL baseURL=new URL("http://www..com");
URL url=new URL(baseURL,"img/bd_logo1.png");
String path=url.toString();//path為"www..com/img/bd_logo1.png"
E. 用java怎麼寫URL介面
在java中，調用http請求介面，主要通過流的方式進行調用，示例介面如下：
/**
* 程序中訪問http數據介面
*/
public String searchLoginService(String urlStr) {
/** 網路的url地址 */
URL url = null;
/** http連接 */
HttpURLConnection httpConn = null;
/**//** 輸入流 */
BufferedReader in = null;
StringBuffer sb = new StringBuffer();
try{
url = new URL(urlStr);
in = new BufferedReader( new InputStreamReader(url.openStream(),"UTF-8") );
String str = null;
while((str = in.readLine()) != null) {
sb.append( str );
}
} catch (Exception ex) {
logger.error(ex.getMessage(), ex);
} finally{
try{
if(in!=null) {
in.close();
}
}catch(IOException ex) {
logger.error(ex.getMessage(), ex);
}
}
String result =sb.toString();
System.out.println(result);
return result;
}
F. java如何獲取網頁中的文字
package test;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.Authenticator;
import java.net.HttpURLConnection;
import java.net.PasswordAuthentication;
import java.net.URL;
import java.net.URLConnection;
import java.util.Properties;
public class URLTest {
// 一個public方法，返回字元串，錯誤則返回"error open url"
public static String getContent(String strUrl) {
try {
URL url = new URL(strUrl);
BufferedReader br = new BufferedReader(new InputStreamReader(url
.openStream()));
String s = "";
StringBuffer sb = new StringBuffer("");
while ((s = br.readLine()) != null) {
sb.append(s + "/r/n");
}
br.close();
return sb.toString();
} catch (Exception e) {
return "error open url:" + strUrl;
}
}
public static void initProxy(String host, int port, final String username,
final String password) {
Authenticator.setDefault(new Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(username,
new String(password).toCharArray());
}
});
System.setProperty("http.proxyType", "4");
System.setProperty("http.proxyPort", Integer.toString(port));
System.setProperty("http.proxyHost", host);
System.setProperty("http.proxySet", "true");
}
public static void main(String[] args) throws IOException {
String url = "https://www.jb51.net";
String proxy = "http://192.168.22.81";
int port = 80;
String username = "username";
String password = "password";
String curLine = "";
String content = "";
URL server = new URL(url);
initProxy(proxy, port, username, password);
HttpURLConnection connection = (HttpURLConnection) server
.openConnection();
connection.connect();
InputStream is = connection.getInputStream();
BufferedReader reader = new BufferedReader(new
InputStreamReader(is));
while ((curLine = reader.readLine()) != null) {
content = content + curLine+ "/r/n";
}
System.out.println("content= " + content);
is.close();
System.out.println(getContent(url));
}
}