java.net.SocketException：来自服务器的文件意外结束
客户端使用 URL 向服务器发送查询。我有一个从 URL 解析信息的 HTTPServer。使用该信息，服务器会做一些工作，然后将响应返回给客户端。
假设网址是：
http://localhost:9090/find?term=healthy&term=cooking&count=3
这工作正常。但是当计数大于或等于 4 时，我得到 java.net.SocketException。为了调试错误，我打印出 URL。System.out.println(输入); 当 count>=4 时，URL 会在控制台中打印两次。请帮忙。
private final HttpServer server;
public Server(int port){
server = HttpServer.create(new InetSocketAddress(port), MAX_BACKLOG);
server.createContext("/isbn", new ISBNHandler());
server.createContext("/find", new TitleHandler());
}
static class TitleHandler implements HttpHandler {
public void handle(HttpExchange t) throws IOException {
int count=5;
String input=t.getRequestURI().toASCIIString();//get the URL
System.out.println(input);
//using info from URL to do some work
String response = builder.toString();//StringBuilder
// System.out.println(response);
t.sendResponseHeaders(200, response.getBytes().length);
OutputStream os = t.getResponseBody();
os.write(response.getBytes());
os.close();
}
}
例外
java.net.SocketException：来自 sun.net.www.http.HttpClient.parseHTTPHeader(Unknown Source) 的服务器的文件意外结束 sun.net.www.http.HttpClient.parseHTTP(Unknown Source) 的 sun.net.www .http.HttpClient.parseHTTPHeader(Unknown Source) at sun.net.www.http.HttpClient.parseHTTP(Unknown Source) at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source) at java.net.HttpURLConnection .getResponseCode(Unknown Source) at TestHarness.assertJSONResponse(TestHarness.java:101) 在 TestHarness.testServer(TestHarness.java:38) 在 TestHarness.main(TestHarness.java:25)
测试线束
import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Sample main method with initial acceptance tests to help you along
*/
public class TestHarness {
private static Pattern MAP_PATTERN = Pattern.compile("(['\"])(.*?)\\1:\\s*(['\"])(.*?)\\3");
private static Pattern LIST_PATTERN = Pattern.compile("\\{(.*?)\\}");
public static void main(String[] args) throws IOException {
/*
if (args.length < 1) {
System.out.println("The test harness requires a single parameter: the location of the CSV file to parse");
}
*/
BookServer server = new BookServer(9090, new File("books.csv"));
server.start();
testServer();
server.stop();
}
/**
* Run initial acceptance tests
*/
@SuppressWarnings("unchecked")
private static void testServer() {
assertJSONResponse("Book Test", "http://localhost:9090/isbn/9780470052327",
createMap("isbn", "9780470052327", "title", "Techniques of Healthy Cooking", "author", "Mary Dierdre Donovan", "publisher", "Wiley", "publishedYear", "2007"));
assertJSONResponse("Book Test", "http://localhost:9090/isbn/9780451169525",
createMap("isbn", "9780451169525", "title", "Misery", "author", "Stephen King", "publisher", "Signet", "publishedYear", "1987"));
assertJSONResponse("Query Test", "http://localhost:9090/find?term=healthy&term=cooking&count=4",
Arrays.asList(createMap("isbn", "9780470052327", "title", "Techniques of Healthy Cooking", "author", "Mary Dierdre Donovan", "publisher", "Wiley", "publishedYear", "2007")));
}
/**
* Helper method to convert the vararg parameters into a Map. Assumes alternating key, value, key, value... and calls
* toString on all args
*
* @param args the parameters to put in the map, alternating key ancd value
* @return Map of String representations of the parameters
*/
private static Map<String, String> createMap(Object ... args) {
Map<String, String> map = new HashMap<String, String>();
for (int i=0; i < args.length; i+=2) {
map.put(args[i].toString(), args[i+1].toString());
}
return map;
}
/**
* Parses a JSON list of maps
* NOTE: assumes all keys and values in the nested maps are quoted
*
* @param content the JSON representation
* @return a list of parsed Map content
*/
private static List<Map<String, String>> parseJSONList(CharSequence content) {
List<Map<String, String>> list = new ArrayList<Map<String, String>>();
Matcher m = LIST_PATTERN.matcher(content);
while(m.find()) {
list.add(parseJSONMap(m.group(1)));
}
return list;
}
/**
* Parse JSON encoded content into a Java Map.
* NOTE: Assumes that all elements in the map are quoted
*
* @param content the JSON representation to be parsed
* @return A map of parsed content
*/
private static Map<String, String> parseJSONMap(CharSequence content) {
Map<String, String> map = new HashMap<String, String>();
Matcher m = MAP_PATTERN.matcher(content);
while (m.find()) {
map.put(m.group(2), m.group(4));
}
return map;
}
/**
* Retrieve content from a test URL and assert that its content is the expected. Results will be printed to System.out for convenience
*
* @param testName Name of the test, to be used simply for labelling
* @param urlString The URL to test
* @param expected The content expected at that URL
*/
private static void assertJSONResponse(String testName, String urlString, Object expected) {
try {
URL url = new URL(urlString);
HttpURLConnection con = ((HttpURLConnection)url.openConnection());
if (!assertTest(testName + " - response code", con.getResponseCode(), 200)) return;
StringBuilder b = new StringBuilder();
BufferedReader r = new BufferedReader(new InputStreamReader(con.getInputStream()));
String line;
while((line = r.readLine()) != null) b.append(line);
String result = b.toString();
assertTest(testName + " - content retrieved", !result.isEmpty(), true);
Object parsed = result.trim().startsWith("[") ? parseJSONList(result) : parseJSONMap(result);
assertTest(testName + " - parsed content match", parsed, expected);
} catch (Exception e) {
System.out.println(testName + ": <<<FAILED with Exception>>>");
e.printStackTrace(System.out);
}
}
/**
* Log the results of a test assertion
*
* @param testName Name of the test, to be used simply for labelling
* @param result The result of the operation under test
* @param expected The expected content that the result will be compared against
* @return whether the test was successful
*/
private static boolean assertTest(String testName, Object result, Object expected) {
boolean passed = result.equals(expected);
System.out.println(testName + (passed ? ": <<<PASSED>>>" : String.format(": <<<FAILED>>> expected '%s' but was '%s'", expected, result)));
return passed;
}
}