java請求url
Ⅰ java獲取URL
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
public class GetLinks {
private String webSource;
private String url;
public GetLinks(String url) throws MalformedURLException, IOException {
this.url = Complete(url);
webSource = getWebCon(this.url);
}
private String getWebCon(String strURL) throws MalformedURLException,
IOException {
StringBuffer sb = new StringBuffer();
java.net.URL url = new java.net.URL(strURL);
BufferedReader in = new BufferedReader(new InputStreamReader(url
.openStream()));
String line;
while ((line = in.readLine()) != null) {
sb.append(line);
}
in.close();
return sb.toString();
}
private String Complete(String link)throws MalformedURLException{
URL url1 = new URL(link);
URL url2 = new URL(link+"/");
String handledUrl = link;
try{
StringBuffer sb1 = new StringBuffer();
BufferedReader in1 = new BufferedReader(new InputStreamReader(url1
.openStream()));
String line1;
while ((line1 = in1.readLine()) != null) {
sb1.append(line1);
}
in1.close();
StringBuffer sb2 = new StringBuffer();
BufferedReader in2 = new BufferedReader(new InputStreamReader(url2
.openStream()));
String line2;
while ((line2 = in2.readLine()) != null) {
sb2.append(line2);
}
in1.close();
if(sb1.toString().equals(sb2.toString())){
handledUrl = link+"/";
}
}catch(Exception e){
handledUrl = link;
}
return handledUrl;
}
/**
* 處理鏈接的相對路徑
* @param link 相對路徑或絕對路徑
* @return 絕對路徑
*/
private String urlHandler(String link) {
if (link == null)
return null;
link = link.trim();
if (link.toLowerCase().startsWith("http://")
|| link.toLowerCase().startsWith("https://")) {
return link;
}
String pare = url.trim();
if (!link.startsWith("/")) {
if (pare.endsWith("/")) {
return pare + link;
}
if (url.lastIndexOf("/") == url.indexOf("//") + 1 || url.lastIndexOf("/") == url.indexOf("//") + 2) {
return pare + "/" + link;
} else {
int lastSeparatorIndex = url.lastIndexOf("/");
return url.substring(0, lastSeparatorIndex + 1) + link;
}
}else{
if (url.lastIndexOf("/") == url.indexOf("//") + 1 || url.lastIndexOf("/") == url.indexOf("//") + 2) {
return pare + link;
}else{
return url.substring(0,url.indexOf("/", url.indexOf("//")+3)) + link;
}
}
}
public List<String> getAnchorTagUrls() {
if (webSource == null) {
System.out.println("沒有網頁源代碼");
return null;
}
ArrayList<String> list = new ArrayList<String>();
int index = 0;
while (index != -1) {
index = webSource.toLowerCase().indexOf("<a ", index);
if (index != -1) {
int end = webSource.indexOf(">", index);
String str = webSource.substring(index, end == -1 ? webSource
.length() : end);
str = str.replaceAll("\\s*=\\s*", "=");
if (str.toLowerCase().matches("^<a.*href\\s*=\\s*[\'|\"]?.*")) {// "^<a\\s+\\w*\\s*href\\s*=\\s*[\'|\"]?.*"
int hrefIndex = str.toLowerCase().indexOf("href=");
int leadingQuotesIndex = -1;
if ((leadingQuotesIndex = str.indexOf("\"", hrefIndex
+ "href=".length())) != -1) { // 形如<a
// href=".....">
int TrailingQuotesIndex = str.indexOf("\"",
leadingQuotesIndex + 1);
TrailingQuotesIndex = TrailingQuotesIndex == -1 ? str
.length() : TrailingQuotesIndex;
str = str.substring(leadingQuotesIndex + 1,
TrailingQuotesIndex);
str = urlHandler(str);
list.add(str);
System.out.println(str);
index += "<a ".length();
continue;
}
if ((leadingQuotesIndex = str.indexOf("\'", hrefIndex
+ "href=".length())) != -1) { // 形如<a
// href='.....'>
int TrailingQuotesIndex = str.indexOf("\'",
leadingQuotesIndex + 1);
TrailingQuotesIndex = TrailingQuotesIndex == -1 ? str
.length() : TrailingQuotesIndex;
str = str.substring(leadingQuotesIndex + 1,
TrailingQuotesIndex);
str = urlHandler(str);
System.out.println(str);
list.add(str);
index += "<a ".length();
continue;
}
int whitespaceIndex = str.indexOf(" ", hrefIndex
+ "href=".length()); // 形如<a href=
// http://www..com >
whitespaceIndex = whitespaceIndex == -1 ? str.length()
: whitespaceIndex;
str = str.substring(hrefIndex + "href=".length(),
whitespaceIndex);
str = urlHandler(str);
list.add(str);
System.out.println(str);
}
index += "<a ".length();
}
}
return list;
}
public static void main(String[] args) throws Exception {
GetLinks gl = new GetLinks("http://www..com");
List<String> list = gl.getAnchorTagUrls();
for(String str:list) {
System.out.println(str);
}
}
}
Ⅱ java解析出url請求的路徑和參數鍵值對類
解析url,本想用正則表達式處理，但正則表達式速度較慢。用split處理一下就可以了。
packageRequestPackage;
importjava.util.HashMap;
importjava.util.Map;
publicclassCRequest{
/**
*解析出url請求的路徑，包括頁面
*@paramstrURLurl地址
*@returnurl路徑
*/
publicstaticStringUrlPage(StringstrURL)
{
StringstrPage=null;
String[]arrSplit=null;
strURL=strURL.trim().toLowerCase();
arrSplit=strURL.split("[?]");
if(strURL.length()>0)
{
if(arrSplit.length>1)
{
if(arrSplit[0]!=null)
{
strPage=arrSplit[0];
}
}
}
returnstrPage;
}
/**
*去掉url中的路徑，留下請求參數部分
*@paramstrURLurl地址
*@returnurl請求參數部分
*/
(StringstrURL)
{
StringstrAllParam=null;
String[]arrSplit=null;
strURL=strURL.trim().toLowerCase();
arrSplit=strURL.split("[?]");
if(strURL.length()>1)
{
if(arrSplit.length>1)
{
if(arrSplit[1]!=null)
{
strAllParam=arrSplit[1];
}
}
}
returnstrAllParam;
}
/**
*解析出url參數中的鍵值對
*如"index.jsp?Action=del&id=123"，解析出Action:del,id:123存入map中
*@paramURLurl地址
*@returnurl請求參數部分
*/
publicstaticMap<String,String>URLRequest(StringURL)
{
Map<String,String>mapRequest=newHashMap<String,String>();
String[]arrSplit=null;
StringstrUrlParam=TruncateUrlPage(URL);
if(strUrlParam==null)
{
returnmapRequest;
}
//每個鍵值為一組www.2cto.com
arrSplit=strUrlParam.split("[&]");
for(StringstrSplit:arrSplit)
{
String[]arrSplitEqual=null;
arrSplitEqual=strSplit.split("[=]");
//解析出鍵值
if(arrSplitEqual.length>1)
{
//正確解析
mapRequest.put(arrSplitEqual[0],arrSplitEqual[1]);
}
else
{
if(arrSplitEqual[0]!="")
{
//只有參數沒有值，不加入
mapRequest.put(arrSplitEqual[0],"");
}
}
}
returnmapRequest;
}
}
測試類
packageRequestPackage;
importjava.util.Map;
publicclassTestCRequest{
/**用於測試CRequest類
*@paramargs
*/
publicstaticvoidmain(String[]args){
//請求url
Stringstr="index.jsp?Action=del&id=123&sort=";
//url頁面路徑
System.out.println(CRequest.UrlPage(str));
//url參數鍵值對
StringstrRequestKeyAndValues="";
Map<String,String>mapRequest=CRequest.URLRequest(str);
for(StringstrRequestKey:mapRequest.keySet()){
StringstrRequestValue=mapRequest.get(strRequestKey);
strRequestKeyAndValues+="key:"+strRequestKey+",Value:"+strRequestValue+";";
}
System.out.println(strRequestKeyAndValues);
//獲取無效鍵時，輸出null
System.out.println(mapRequest.get("page"));
}
}
測試代碼運行效果
index.jsp
key:id,Value:123;key:sort,Value:;key:action,Value:del;
null
Ⅲ 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;
}
Ⅳ 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。
Ⅳ java獲取請求前的前兩次訪問url，該怎麼獲取
在HTTP的request對象中,可以取到HTTP頭HEADER,其中有一個是"Referer",通過它,我們可以知道上上個請求的URL,這在某些場合中相當有用.
如在一個列表頁中,通常會有一個刪除鏈接,刪除列表中的某項數據,如果希望刪除成功後再返回到該列表頁,可以如下做法:
java 代碼
String retUrl = request.getHeader("Referer");
if(retUrl != null){
response.sendRedirect(retUrl);
}
就這么簡單,就可以了.
對於添加和編輯操作,同樣可以這樣做,只是稍微變通一下,要傳一次從上個頁面中獲取的Referer.
Ⅵ java request 如何取到發送請求的地址是什麼
request對象通過以下方法來獲取請求路徑，如下所示：
String getServerName()：獲取伺服器名，localhost；
String getServerPort()：獲取伺服器埠號，8080；
String getContextPath()：獲取項目名，/Example；
String getServletPath()：碰舉獲取Servlet路譽態徑，/AServlet；
String getQueryString()：獲取參數部分，即問號後面的部笑虛碧分：username=zhangsan
String getRequestURI()：獲取請求URI，等於項目名+Servlet路徑：/Example/AServlet
String getRequestURL()：獲取請求URL，等於不包含參數的整個請求路徑：http://localhost:8080/Example/AServlet 。
Ⅶ 關於java調用url介面方法的問題
對於具體的數據請求方式、請求方式、響應數據格式要看你的介面要求，這是通用代碼:
importjava.io.BufferedReader;
importjava.io.IOException;
importjava.io.InputStreamReader;
importjava.net.HttpURLConnection;
importjava.net.URL;
publicclassTest{
publicstaticvoidmain(String[]args)throwsIOException{
System.out.println(getData());
}
publicstaticStringgetData()throwsIOException{
//創建指定url的url對象,這里的地址是:淘寶商品搜索建議
URLurl=newURL("https://suggest.taobao.com/sug?code=utf-8&q=電腦&callback=cb");
//創建http鏈接對象
HttpURLConnectioncon=(HttpURLConnection)url.openConnection();
//設置請求方式
con.setRequestMethod("POST");
//打開鏈接,上一步和該步驟作用相同，可以省略
con.connect();
//獲取請求返回內容並設置編碼為UTF-8
BufferedReaderreader=newBufferedReader(newInputStreamReader(con.getInputStream(),"UTF-8"));
//將返回數據拼接為字元串
StringBuffersb=newStringBuffer();
//臨時字元串
Stringtemp=null;
//獲取數據
while((temp=reader.readLine())!=null){
sb.append(temp);
}
//關閉流
reader.close();
returnsb.toString();
}
}
結果:
Ⅷ java中 如何獲取客戶端請求的url
在servlet中的request對象中有url，可以用方法 getRequestURI（）.
如果在程序中得不到該請求的request對象 那就得不到。
所以得到url的 關鍵是 先得到 request