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java中 如何获取客户端请求的url
在servlet中的request对象中有url，可以用方法 getRequestURI（）.
如果在程序中得不到该请求的request对象 那就得不到。
所以得到url的 关键是 先得到 request
java远程请求url地址，并且要求传递参数，应该怎么实现
public String getHTML(String httpUrl, String Charset) {
String html = "";
try {
URL url = new URL(httpUrl.toString());
StringBuffer document = new StringBuffer();
try {
URLConnection urlCon = (HttpURLConnection) url.openConnection();
BufferedReader reader = new BufferedReader(
new InputStreamReader(urlCon.getInputStream()));
String Result = "";
while ((Result = reader.readLine()) != null) {
document.append(Result);
// System.out.println(Result);
}
html = document.toString();
} catch (IOException e) {
html = "服务未响应";
}
} catch (MalformedURLException e) {
html = "不支持的协议";
}
return html;
}
Java请求一个URL。获取网站返回的数据。
public static String SendGET(String url,String param){
String result="";//访问返回结果
BufferedReader read=null;//读取访问结果
try {
//创建url
URL realurl=new URL(url+"?"+param);
//打开连接
URLConnection connection=realurl.openConnection();
// 设置通用的请求属性
connection.setRequestProperty("accept", "*/*");
connection.setRequestProperty("connection", "Keep-Alive");
connection.setRequestProperty("user-agent",
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
//建立连接
connection.connect();
// 获取所有响应头字段
MapString, ListString map = connection.getHeaderFields();
// 遍历所有的响应头字段，获取到cookies等
for (String key : map.keySet()) {
System.out.println(key + "---" + map.get(key));
}
// 定义 BufferedReader输入流来读取URL的响应
read = new BufferedReader(new InputStreamReader(
connection.getInputStream(),"UTF-8"));
String line;//循环读取
while ((line = read.readLine()) != null) {
result += line;
}
} catch (IOException e) {
e.printStackTrace();
}finally{
if(read!=null){//关闭流
try {
read.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return result;
}
java建立url请求 服务器怎么写
//get请求
public String get(String url){
HttpURLConnection conn = null;
BufferedReader rd = null ;
StringBuilder sb = new StringBuilder ();
String line = null ;
String response = null;
try {
conn = (HttpURLConnection) new URL(url).openConnection();
conn.setRequestMethod("GET");
conn.setDoInput(true);
//conn.setReadTimeout(20000);
//conn.setConnectTimeout(20000);
conn.setUseCaches(false);
conn.connect();
rd = new BufferedReader( new InputStreamReader(conn.getInputStream(), "UTF-8"));
while ((line = rd.readLine()) != null ) {
sb.append(line);
}
response = sb.toString();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}finally{
try {
if(rd != null){
rd.close();
}
if(conn != null){
conn.disconnect();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return response;
}
//post表单请求
public String post(String url, MapString, String form){
HttpURLConnection conn = null;
PrintWriter pw = null ;
BufferedReader rd = null ;
StringBuilder out = new StringBuilder();
StringBuilder sb = new StringBuilder();
String line = null ;
String response = null;
for (String key : form.keySet()) {
if(out.length()!=0){
out.append("");
}
out.append(key).append("=").append(form.get(key));
}
try {
conn = (HttpURLConnection) new URL(url).openConnection();
conn.setRequestMethod("POST");
conn.setDoOutput(true);
conn.setDoInput(true);
//conn.setReadTimeout(20000);
//conn.setConnectTimeout(20000);
conn.setUseCaches(false);
conn.connect();
pw = new PrintWriter(conn.getOutputStream());
pw.print(out.toString());
pw.flush();
rd = new BufferedReader( new InputStreamReader(conn.getInputStream(), "UTF-8"));
while ((line = rd.readLine()) != null ) {
sb.append(line);
}
response = sb.toString();
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}finally{
try {
if(pw != null){
pw.close();
}
if(rd != null){
rd.close();
}
if(conn != null){
conn.disconnect();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return response;
}
