Question

我的Google App Engine-servlet处理后请求。它尝试获取XML字符串，但特殊字符会被更改。像å/ä/ö这样的瑞典字符被转换成类似的东西：Ã¥

public String getXML(HttpServletRequest req){
    String XML = "";
    try {
        BufferedReader b = req.getReader();
        StringBuffer xmlBuffer = new StringBuffer();
        while((XML = b.readLine()) != null) {  
               xmlBuffer.append(XML);  
        }
        XML = xmlBuffer.toString();
    } catch (IOException e) {
        //maybe later
    }
    return XML;
}

后期数据始终是UTF-8的XML字符串，用于验证散列。

编辑问题：2013-12-05

Answer 1

在这个构造中

new String(XML.getBytes(),"UTF-8")

你正在重新解释从platform's default charset到UTF-8的字符串字节。

尝试在没有任何显式转换的情况下阅读请求，例如：

public String getXML(HttpServletRequest req){
    try {
        BufferedReader b = req.getReader();
        StringBuffer xmlBuffer = new StringBuffer();
        String XML;
        while((XML = b.readLine()) != null) {  
               xmlBuffer.append(XML);  
        }
        return xmlBuffer.toString();
    } catch (IOException e) {
        throw new RuntimeException(e);
    }
}

或使用Apache IOUtils：

public String getXML(HttpServletRequest req) {
    try {
        return IOUtils.toString(req.getReader());
    } catch (IOException e) {
        throw new RuntimeException(e);
    }
}

getReader()负责执行任何nessesary字符转换，如stated in the javadoc

读者根据身体上使用的字符编码翻译字符数据

Answer 2

我设法找到（谷歌）答案..终于。

req.setCharacterEncoding("UTF-8");
public String getXML(HttpServletRequest req) throws IOException{    
    String input = null;
    if ((input = (String) req.getAttribute("com.xp.input")) == null) {
        StringBuilder buffer = new StringBuilder();
        BufferedReader reader = req.getReader();

        String line;
        while((line = reader.readLine()) != null){
            buffer.append(line);
        }
        input = buffer.toString();
        req.setAttribute("com.xp.input", input);
    }
    if (input == null) {
        return "";
    } 
    String header = "<?xml version=\"1.0\" encoding=\"utf-8\"?>";
    String body = input.substring(38, input.lastIndexOf('>')+1);
    body = body.substring(body.indexOf('<'));
    return header+"\n"+body+"\n";

}

这对我有用，我刚找到另一篇文章的代码，并添加了一些字符编码。

Google App Engine - Java - 在阅读请求后，特殊字符会被更改

2 个答案: