qqr*_*ryq 7 java xml sockets post serversocket
我尝试在Java中编写最简单的服务器应用程序,显示带有textarea输入的html表单,在提交后,我可以解析在该textarea中键入的xml.现在,我构建简单的基于服务器的服务器,如下所示:
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
public class WebServer {
protected void start() {
ServerSocket s;
String gets = "";
System.out.println("Start on port 80");
try {
// create the main server socket
s = new ServerSocket(80);
} catch (Exception e) {
System.out.println("Error: " + e);
return;
}
System.out.println("Waiting for connection");
for (;;) {
try {
// wait for a connection
Socket remote = s.accept();
// remote is now the connected socket
System.out.println("Connection, sending data.");
BufferedReader in = new BufferedReader(new InputStreamReader(
remote.getInputStream()));
PrintWriter out = new PrintWriter(remote.getOutputStream());
String str = ".";
while (!str.equals("")) {
str = in.readLine();
if (str.contains("GET")){
gets = str;
break;
}
}
out.println("HTTP/1.0 200 OK");
out.println("Content-Type: text/html");
out.println("");
// Send the HTML page
String method = "get";
out.print("<html><form method="+method+">");
out.print("<textarea name=we></textarea></br>");
out.print("<input type=text name=a><input type=submit></form></html>");
out.println(gets);
out.flush();
remote.close();
} catch (Exception e) {
System.out.println("Error: " + e);
}
}
}
public static void main(String args[]) {
WebServer ws = new WebServer();
ws.start();
}
}
在表单(带有xml的textarea和一个额外的文本输入)之后,在'gets'字符串类型变量中提交我的变量的Urlencoded值(也显示在屏幕上,它看起来像这样:
gets = GET /?we=%3Cnetwork+ip_addr%3D%2210.0.0.0%2F8%22+save_ip%3D%22true%22%3E%0D%0A%3Csubnet+interf_used%3D%22200%22+name%3D%22lan1%22+%2F%3E%0D%0A%3Csubnet+interf_used%3D%22254%22+name%3D%22lan2%22+%2F%3E%0D%0A%3C%2Fnetwork%3E&a=fooBar HTTP/1.1
我该怎么做才能将GET更改为POST方法(如果我只是在表单中更改它而不是放"if(str.contains("POST")){"它给我字符串像
gets = POST / HTTP/1.1
没有变数.之后,我如何在textarea字段中使用xml(称为'we')？
小智 15
由于标题后面有一个空行,在使用readLine()BufferedReader方法读取标题信息之后,这是获取后有效负载数据的相对简单的方法.
//socket is an instance of Socket
InputStream is = socket.getInputStream();
InputStreamReader isReader = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isReader);
//code to read and print headers
String headerLine = null;
while((headerLine = br.readLine()).length() != 0){
System.out.println(headerLine);
}
//code to read the post payload data
StringBuilder payload = new StringBuilder();
while(br.ready()){
payload.append((char) br.read());
}
System.out.println("Payload data is: "+payload.toString())
这是我读取POST主体的实现:
try {
Socket socket = params[0];
BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
BufferedWriter out = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()));
// read request
String line;
line = in.readLine();
StringBuilder raw = new StringBuilder();
raw.append("" + line);
boolean isPost = line.startsWith("POST");
int contentLength = 0;
while (!(line = in.readLine()).equals("")) {
raw.append('\n' + line);
if (isPost) {
final String contentHeader = "Content-Length: ";
if (line.startsWith(contentHeader)) {
contentLength = Integer.parseInt(line.substring(contentHeader.length()));
}
}
}
StringBuilder body = new StringBuilder();
if (isPost) {
int c = 0;
for (int i = 0; i < contentLength; i++) {
c = in.read();
body.append((char) c);
Log.d("JCD", "POST: " + ((char) c) + " " + c);
}
}
raw.append(body.toString());
publishProgress(raw.toString());
// send response
out.write("HTTP/1.1 200 OK\r\n");
out.write("Content-Type: text/html\r\n");
out.write("\r\n");
out.write(new Date().toString());
if (isPost) {
out.write("<br><u>" + body.toString() + "</u>");
} else {
out.write("<form method='POST'>");
out.write("<input name='name' type='text'/>");
out.write("<input type='submit'/>");
out.write("</form>");
}
//
// do not in.close();
out.flush();
out.close();
socket.close();
//
} catch (Exception e) {
e.printStackTrace();
StringWriter sw = new StringWriter();
e.printStackTrace(new PrintWriter(sw));
publishProgress('\n' + sw.toString());
}
我是为Android做的,publishProgres在我的情况下意味着:
protected void onProgressUpdate(String... values) {
super.onProgressUpdate(values);
instance.logTextView.append(values[0]);
}
典型的HTTP POST请求如下所示:
POST / HTTP/1.1
Host: www.example.com
Accept: text/html,*/*;q=0.5
User-Agent: BrowserName/1.0
Referer: http://www.example.com/
Content-type: application/x-www-form-urlencoded; charset=utf-8
foo=1&bar=2
第一行包含方法(通常是GET或POST,但还有更多,如HEAD,PUT,DELETE),请求URI和协议版本.然后有许多请求标头,这对于简单的服务器可能不那么重要.如果该方法是一个接受请求体(POST和PUT)的方法,那么在标题之后有一个空白行,后跟请求体.对于来自HTML表单的POST,正文将包含key=value所有表单元素的对,由连接&.值将为%-encoded.
您只需要妥善解析整个请求.
您应该知道HTTP中的行结尾应该是Windows风格的(\r\n).该readline()方法可能将此解释为两个换行符,因此看起来每个实际行之间都有一条空行.
POST 数据不在第一行。打印所有行，您就会看到。它实际上紧接在一个空行之后。
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