2024年6月11日发(作者：)

HTTPserver从HttpExchange解析参数

You now in Java 6 has some APIs to create lightweight HTTP server. Well, today,

I had to created a lightweight HTTP server embedded in an application, but when I

try to get the parameters for a request I noticed the HttpExchange class doesn’t

have a method for that.

After some researches on Google, I come across a solution.

What I did was to create a Filter class which will deal with the parameters

parse:

public class ParameterFilter extends Filter {

@Override

public String description() {

return "Parses the requested URI for parameters";

}

@Override

public void doFilter(HttpExchange exchange, Chain chain)

throws IOException {

parseGetParameters(exchange);

parsePostParameters(exchange);

er(exchange);

}

private void parseGetParameters(HttpExchange exchange)

throws UnsupportedEncodingException {

Map parameters = new HashMap();

URI requestedUri = uestURI();

String query = Query();

parseQuery(query, parameters);

ribute("parameters", parameters);

}

private void parsePostParameters(HttpExchange exchange)

throws IOException {

if ("post".equalsIgnoreCase(uestMethod())) {

@SuppressWarnings("unchecked")

Map parameters =

(Map)ribute("parameters");

InputStreamReader isr =

new InputStreamReader(uestBody(),"utf-8");

BufferedReader br = new BufferedReader(isr);

String query = ne();

parseQuery(query, parameters);

}

}

@SuppressWarnings("unchecked")

private void parseQuery(String query, Map parameters)

throws UnsupportedEncodingException {

if (query != null) {

String pairs[] = ("[&]");

for (String pair : pairs) {

String param[] = ("[=]");

String key = null;

String value = null;

if ( > 0) {

key = (param[0],

perty("ng"));

}

if ( > 1) {

value = (param[1],

perty("ng"));

}

if (nsKey(key)) {

Object obj = (key);

if(obj instanceof List) {

List values = (List)obj;

(value);

} else if(obj instanceof String) {

List values = new ArrayList();

((String)obj);

(value);

(key, values);

}

} else {

(key, value);

}

}

}

}

}

After that you can add this filter to your HttpServer context:

HttpServer server = (new InetSocketAddress(80), 0);

HttpContext context = Context("/myapp", new myHttpHandler());

ters().add(new ParameterFilter());

();

Then you can do something like below in your HttpHandler to get the

parameters:

public class MyHttpHandler implements HttpHandler {

@Override

public void handle(HttpExchange exchange) throws IOException {

Map params =

(Map)ribute("parameters");

//now you can use the params

}

}

Well, that’s all! I hope you enjoy the tip!