java - java从网页读取数据时出错？

Question

我正在使用此代码从网页读取数据:

public class ReadLatex {
public static void main(String[] args) throws IOException {
    String urltext = "http://chart.apis.google.com/chart?cht=tx&chl=1+2%20\frac{3}{4}";
    URL url = new URL(urltext);
    BufferedReader in = new BufferedReader(new InputStreamReader(url
            .openStream()));
    String inputLine;

    while ((inputLine = in.readLine()) != null) {
        // Process each line.
        System.out.println(inputLine);
    }
    in.close();
   }
}

该网页在 URL 中提供了 latex 代码的图像。

我收到此异常:

Exception in thread "main" java.io.IOException: Server returned HTTP response code: 400 for URL: http://chart.apis.google.com/chart?
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
at java.net.URL.openStream(Unknown Source)
at ReadLatex.main(ReadLatex.java:11)

谁能告诉我为什么会遇到这个问题以及解决方案是什么？

Answer 1

尝试使用 org.apache.commons.lang.StringEscapeUtils 等转义