要从一个被屏蔽的网站上下载一些东西,于是写了一个Servlet,将它传到了一台境外的服务器上.
让这台服务器去下载指定的资源,然后再回传给我.相当于一个代理吧.public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String url = request.getParameter("url"); //得到要下载的资源的URL. if (!StringUtils.isNullOrEmpty(url)) {
System.out.println(url);
URL u = new URL(url);
URLConnection conn = u.openConnection(); try { ///把响应头设置成一样的.
for (Map.Entry<String, List<String>> m : conn.getHeaderFields()
.entrySet()) {
if (m != null && m.getKey() != null && m.getValue() != null
&& m.getValue().size() > 0) {
response.setHeader(m.getKey(), m.getValue().get(0));
}
}
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
CommonLog.log.warn(e);
} InputStream in = conn.getInputStream(); //从 connection得到inputstream
OutputStream out = response.getOutputStream(); //得到向客户端的输出流
try {
IOUtils
.write(conn.getInputStream(), response
.getOutputStream()); //写数据.
} catch (Exception e) {
e.printStackTrace();
// TODO: handle exception
CommonLog.log.warn(e);
if (in != null) {
in.close();
}
if (out != null) {
out.close();
}
}
}
}IOUtils.write()代码如下: /**
* 从input里面读取数据然后写入output,读完后自动关闭流。
* @param input inputStream
* @param output outputStream
* */
public static void write(InputStream input, OutputStream output)
throws IOException {
write(input,output,true);
} /**
* 自动从inputstream里面读数据,然后写到outputstream里面去。
* @param input inputstream
* @param output outputstream
* @param close 读完后是否自动关闭流。
* */
public static void write(InputStream input, OutputStream output,boolean close)
throws IOException {
byte[] b = new byte[1024];
int len = input.read(b);
while (len != -1) {
output.write(b, 0, len);
len = input.read(b);
}
output.flush();
if (close) {
input.close();
output.close();
}
}将程序传到服务器上以后,在服务器上访问
http://localhost:8080/test/down?url=http://www.xxx.com/z.zip
可以下载成功.但是当远程访问的时候,就会出现
java.net.SocketException: Connection reset by peer: socket write error假设服务器IP是2.2.2.2吧.访问
http://2.2.2.2:8080/test/down?url=http://www.xxx.com/z.zip
就会出现上面的那个错误.
注意,我并没有关闭浏览器或者按停止按钮.只要一打上那个地址就会出错.
错误发生在:output.write(b, 0, len);//执行这行代码的时候.具体的错误信息如下:
ClientAbortException: java.net.SocketException: Connection reset by peer: socket write error
at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:366)
at org.apache.tomcat.util.buf.ByteChunk.flushBuffer(ByteChunk.java:432)
at org.apache.tomcat.util.buf.ByteChunk.append(ByteChunk.java:347)
at org.apache.catalina.connector.OutputBuffer.writeBytes(OutputBuffer.java:392)
at org.apache.catalina.connector.OutputBuffer.write(OutputBuffer.java:381)
at org.apache.catalina.connector.CoyoteOutputStream.write(CoyoteOutputStream.java:89)
at com.joejoe.utils.IOUtils.write(IOUtils.java:62)
at com.joejoe.utils.IOUtils.write(IOUtils.java:48)
at com.tqsoft.wdys.other.getMegavideo.doGet(getMegavideo.java:79)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:627)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at com.joejoe.utils.web.CharSetFilter.doFilter(CharSetFilter.java:39)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:875)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
at java.lang.Thread.run(Unknown Source)
Caused by: java.net.SocketException: Connection reset by peer: socket write error
at java.net.SocketOutputStream.socketWrite0(Native Method)
at java.net.SocketOutputStream.socketWrite(Unknown Source)
at java.net.SocketOutputStream.write(Unknown Source)
at org.apache.coyote.http11.InternalOutputBuffer.realWriteBytes(InternalOutputBuffer.java:750)
at org.apache.tomcat.util.buf.ByteChunk.flushBuffer(ByteChunk.java:432)
at org.apache.tomcat.util.buf.ByteChunk.append(ByteChunk.java:347)
at org.apache.coyote.http11.InternalOutputBuffer$OutputStreamOutputBuffer.doWrite(InternalOutputBuffer.java:773)
at org.apache.coyote.http11.filters.IdentityOutputFilter.doWrite(IdentityOutputFilter.java:118)
at org.apache.coyote.http11.InternalOutputBuffer.doWrite(InternalOutputBuffer.java:583)
at org.apache.coyote.Response.doWrite(Response.java:560)
at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:361)
... 27 more请问如何解决.谢谢.
让这台服务器去下载指定的资源,然后再回传给我.相当于一个代理吧.public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String url = request.getParameter("url"); //得到要下载的资源的URL. if (!StringUtils.isNullOrEmpty(url)) {
System.out.println(url);
URL u = new URL(url);
URLConnection conn = u.openConnection(); try { ///把响应头设置成一样的.
for (Map.Entry<String, List<String>> m : conn.getHeaderFields()
.entrySet()) {
if (m != null && m.getKey() != null && m.getValue() != null
&& m.getValue().size() > 0) {
response.setHeader(m.getKey(), m.getValue().get(0));
}
}
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
CommonLog.log.warn(e);
} InputStream in = conn.getInputStream(); //从 connection得到inputstream
OutputStream out = response.getOutputStream(); //得到向客户端的输出流
try {
IOUtils
.write(conn.getInputStream(), response
.getOutputStream()); //写数据.
} catch (Exception e) {
e.printStackTrace();
// TODO: handle exception
CommonLog.log.warn(e);
if (in != null) {
in.close();
}
if (out != null) {
out.close();
}
}
}
}IOUtils.write()代码如下: /**
* 从input里面读取数据然后写入output,读完后自动关闭流。
* @param input inputStream
* @param output outputStream
* */
public static void write(InputStream input, OutputStream output)
throws IOException {
write(input,output,true);
} /**
* 自动从inputstream里面读数据,然后写到outputstream里面去。
* @param input inputstream
* @param output outputstream
* @param close 读完后是否自动关闭流。
* */
public static void write(InputStream input, OutputStream output,boolean close)
throws IOException {
byte[] b = new byte[1024];
int len = input.read(b);
while (len != -1) {
output.write(b, 0, len);
len = input.read(b);
}
output.flush();
if (close) {
input.close();
output.close();
}
}将程序传到服务器上以后,在服务器上访问
http://localhost:8080/test/down?url=http://www.xxx.com/z.zip
可以下载成功.但是当远程访问的时候,就会出现
java.net.SocketException: Connection reset by peer: socket write error假设服务器IP是2.2.2.2吧.访问
http://2.2.2.2:8080/test/down?url=http://www.xxx.com/z.zip
就会出现上面的那个错误.
注意,我并没有关闭浏览器或者按停止按钮.只要一打上那个地址就会出错.
错误发生在:output.write(b, 0, len);//执行这行代码的时候.具体的错误信息如下:
ClientAbortException: java.net.SocketException: Connection reset by peer: socket write error
at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:366)
at org.apache.tomcat.util.buf.ByteChunk.flushBuffer(ByteChunk.java:432)
at org.apache.tomcat.util.buf.ByteChunk.append(ByteChunk.java:347)
at org.apache.catalina.connector.OutputBuffer.writeBytes(OutputBuffer.java:392)
at org.apache.catalina.connector.OutputBuffer.write(OutputBuffer.java:381)
at org.apache.catalina.connector.CoyoteOutputStream.write(CoyoteOutputStream.java:89)
at com.joejoe.utils.IOUtils.write(IOUtils.java:62)
at com.joejoe.utils.IOUtils.write(IOUtils.java:48)
at com.tqsoft.wdys.other.getMegavideo.doGet(getMegavideo.java:79)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:627)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at com.joejoe.utils.web.CharSetFilter.doFilter(CharSetFilter.java:39)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:875)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
at java.lang.Thread.run(Unknown Source)
Caused by: java.net.SocketException: Connection reset by peer: socket write error
at java.net.SocketOutputStream.socketWrite0(Native Method)
at java.net.SocketOutputStream.socketWrite(Unknown Source)
at java.net.SocketOutputStream.write(Unknown Source)
at org.apache.coyote.http11.InternalOutputBuffer.realWriteBytes(InternalOutputBuffer.java:750)
at org.apache.tomcat.util.buf.ByteChunk.flushBuffer(ByteChunk.java:432)
at org.apache.tomcat.util.buf.ByteChunk.append(ByteChunk.java:347)
at org.apache.coyote.http11.InternalOutputBuffer$OutputStreamOutputBuffer.doWrite(InternalOutputBuffer.java:773)
at org.apache.coyote.http11.filters.IdentityOutputFilter.doWrite(IdentityOutputFilter.java:118)
at org.apache.coyote.http11.InternalOutputBuffer.doWrite(InternalOutputBuffer.java:583)
at org.apache.coyote.Response.doWrite(Response.java:560)
at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:361)
... 27 more请问如何解决.谢谢.
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这样做确实没什么影响 不过是为什么 我也不是很清楚!
存在的连接被远程主机强制关闭。通常原因为:远程主机上对等方应用程序突然停止运行,或远程主机重新启动,或远程主机在远程方套接字上使用了“强制”关闭(参见setsockopt(SO_LINGER))。另外,在一个或多个操作正在进行时,如果连接因“keep-alive”活动检测到一个失败而中断,也可能导致此错误。此时,正在进行的操作以错误码WSAENETRESET失败返回,后续操作将失败返回错误码WSAECONNRESET。
Connection reset by peer的原因:
经常出现的Connection reset by peer: 原因可能是多方面的,不过更常见的原因是:
①:服务器的并发连接数超过了其承载量,服务器会将其中一些连接Down掉;
②:客户关掉了浏览器,而服务器还在给客户端发送数据;
③:浏览器端按了Stop
很多人都说是客户端造成的,没有办法控制,是个比较郁闷的问题。
都不是这些原因,就我一个人访问那服务器,我没有关IE,也没有按STOP。
引起该问题的原因是由于此时Server端连接已经被复位,而Client依然通过该连接在接收和发送数据,在网上搜索了一下该错误,发现该错误引起的原因大都是防火墙的原因。
这个问题一般是客户端在连接还没有完全建立的时候就取消连接,比如用户按了浏览器上面的“停止”按钮,一般来说没有什么问题。但是如果频繁出现,就表示很多客户端连接到Apache服务器的响应时间太长了,可能是网络的问题或者服务器性能问题。
引起该问题的原因是由于此时Server端连接已经被复位,而Client依然通过该连接在接收和发送数据,在网上搜索了一下该错误,发现该错误引起的原因大都是防火墙的原因。
关闭UltraVPN这个能解决这个问题么?
严重: Servlet.service() for servlet jsp threw exception
java.net.SocketException: Connection reset by peer: socket write error但是该SocketException不会影响程序正常运行!什么原因俺也不明白。。
connectionTimeout="20000"
redirectPort="8443" maxThreads="1500" minSpareThreads="1000" maxSpareThreads="1500"
acceptCount="2000" />(server.xml中)