api第一句:Returns the query string that is contained in the request URL after the path,这就说明它只对get方法抛的数据有效。post方法传的参数getQueryString将什么都得不到。
我的总结:
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.Enumeration;
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import javax.servlet.http.HttpServletRequest;
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public class QueryString
{
private StringBuffer query = new StringBuffer();
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public QueryString(String name, String value)
{
encode(name, value);
}
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public synchronized void add(String name, String value)
{
query.append('&');
encode(name, value);
}
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private synchronized void encode(String name, String value)
{
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try
{
query.append(URLEncoder.encode(name, "UTF-8"));
query.append('=');
value = value.replaceAll(" ", "%20");
query.append(value);
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} catch (UnsupportedEncodingException e)
{
e.printStackTrace();
}
}
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public String getQuery()
{
return query.toString();
}
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public String toString()
{
return getQuery();
}
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/** *//**
* 直接接受request
* 注:request中提供的getQueryString方法只对Get方法才能生效,
* 在我们不知道方法的情况下最好重写getQueryString
* @param request
* @return
*/
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public static String getQueryString(HttpServletRequest request)
{
boolean first = true;
StringBuffer strbuf = new StringBuffer("");
Enumeration emParams = request.getParameterNames();
//do-while
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do
{
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if (!emParams.hasMoreElements())
{
break;
}
String sParam = (String) emParams.nextElement();
String[] sValues = request.getParameterValues(sParam);
String sValue = "";
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for (int i = 0; i < sValues.length; i++)
{
sValue = sValues[i];
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if (sValue != null && sValue.trim().length() != 0 && first == true)
{
//第一个参数
first = false;
strbuf.append(sParam).append("=").append(sValue);
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} else if (sValue != null && sValue.trim().length() != 0 && first == false)
{
strbuf.append("&").append(sParam).append("=").append(sValue);
}
}
} while (true);
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return strbuf.toString();
}
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public static void main(String args[])
{
QueryString qs = new QueryString("parms1", "1");
qs.add("parms", "2");
qs.add("parms", "3");
System.out.println(qs.toString()); //parms1=1&parms=2&parms=3
}
}
posted on 2010-01-31 14:08
fly 阅读(2075)
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