在form.action="servlet?china=中文" 附带了中文参数，但servlet里面得到的china=null，请问只用这种形式传递参数china，究竟有没有办法

Question

你不要用form.action的方法，应该用hidden字段
<form action="servlet" method="post|get">
<input type="hidden" name="china" value="中文">
...
这样如果需要的话，还可以在js中修改china的值

Answer 1

完全赞同楼上，后者，对中文进行encode一下，用javascript

Answer 2

如果是这样简单的就可以的话，我就不用问了！！！现在的情况是只能用这种形式，因为这个form是用来上传文件的！！！

Answer 3

用hidden不行的，试过了！！！

Answer 4

这样传中文是不行的，encode等我都试过，无论怎样转换都不行，我是用变能的方法。

Answer 5

doGet是url传值，
doPost是body传值。
要上传文件只能用doPost。
/**
 * <p>Title: UploadFileServlet</p>
 * <p>Description: Upload a file to the serve</p>
 * <p>Copyright: Copyright (c) 2002</p>
 * <p>Company: shadow</p>
 * @author shadow
 * @version 1.0 final
 */
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.FileOutputStream;
import java.io.File;
import java.io.IOException;
import javax.servlet.ServletInputStream;
import javax.servlet.ServletOutputStream;
import javax.servlet.ServletException;public class UploadFileServlet extends HttpServlet {    private ServletInputStream sin = null;
    private OutputStream fout = null;
    private String CharacterEncoding = "";
    private String ContentType = "";
    private String filename = "";    private byte temp[] = new byte[4096];    protected static final String newline = "\n";
    protected static final String UploadDir = "./config/mydomain/applications/DefaultWebApp";    protected final void doPost(HttpServletRequest request, HttpServletResponse response) {
System.out.println("************************************");
        upload(request, response);
    }    protected final void doGet(HttpServletRequest request, HttpServletResponse response) {
System.out.println("************************************");
System.out.println("request.getMethod():" + request.getMethod());
//        upload(request, response);
System.out.println(request.getMethod() + " CAN NOT UPLOAD A FILE");
    }    public void upload(HttpServletRequest request, HttpServletResponse response) {        String ContentType = "";
        int i = 0;        setCharacterEncoding(request.getCharacterEncoding());
System.out.println("request.getMethod():" + request.getMethod());
System.out.println("request.getContentType():" + request.getContentType());
System.out.println("ok");
        setContentType(request.getContentType());        try {
            sin = request.getInputStream();
            filename = getFileName(sin);
//**************
            i = sin.readLine(temp, 0, temp.length);
            if (this.CharacterEncoding != null) {
                ContentType = new String(temp, 0, i, this.CharacterEncoding);
            }
            else {
                ContentType = new String(temp, 0, i);
            }
            System.out.println("ContentType:" + ContentType);
            if (ContentType.indexOf("Content-Type") >= 0) {
                System.out.println("uploading ...");
                sin.readLine(temp, 0, temp.length);
            }
//**************
            if ((filename != null) || (!filename.equals(""))) {
                fout = new FileOutputStream(new File(UploadDir, filename));                while ((i = sin.readLine(temp, 0, temp.length)) !=  -1) {                    if (this.CharacterEncoding != null) {
                        ContentType = new String(temp, 0, i, this.CharacterEncoding);
                    }
                    else {
                        ContentType = new String(temp, 0, i);
                    }
                    if ((ContentType.indexOf(this.ContentType) == 0)&&(temp[0] == 45)) {
                        System.out.println("this.ContentType:" + this.ContentType);
                        break;
                    }                    fout.write(temp,0,i);
//                    fout.write(newline.getBytes());
                }
            }
        }
        catch (IOException ioe) {
            System.out.print(ioe.getMessage());
        }
        finally {
            try {
                fout.close();
            }
            catch (Exception e) {
            }
        }
        System.out.println("*****    FINISHED    ******");    }
    //request.getContentType()方法得到String s
    protected void setContentType(String s) {
        ContentType = s;
        int j;
System.out.println("ContentType.indexOf(\"boundary=\"):" + ContentType.indexOf("boundary="));
        if((j = ContentType.indexOf("boundary=")) != -1) {
            ContentType = ContentType.substring(j + 9);
            ContentType = "--" + ContentType;
        }
        System.out.println("ContentType: " + ContentType);
        //it is commonly null
    }
    //request.getCharacterEncoding()方法得到String s
    protected void setCharacterEncoding(String s) {
        CharacterEncoding = s;
        System.out.println("CharacterEncoding: " + s);
    }
    //get filename
    private String getFileName(ServletInputStream sin) {
        String filename = "";
        String str = "";        int i = 0;
        int j = 0;
        try {            while ((i = sin.readLine(temp, 0, temp.length)) != -1) {
                if (this.CharacterEncoding != null) {
                    str = new String(temp, 0, i, this.CharacterEncoding);
                }
                else {
                    str = new String(temp, 0, i);
                }
                if ((j = str.indexOf("filename=")) != -1) {
                    j += 10;
                    str = str.substring(j);
                    System.out.println("str:" + str);
                    // the last string of "
                    if ((j = str.indexOf("\"")) > 0) {
                        str = str.substring(0, j);
                    }
                    //now str is the file directory in the client pc
                    if ((j = str.lastIndexOf("\\")) != -1) {
                        filename = str.substring(j);
                    }
                    break;
                }
            }
        }
        catch (IOException ioe) {
            System.out.println("ERROR");
            System.out.println(ioe.getMessage());
        }        System.out.println("filename:" + filename + ".");
        return filename;
    }
}
<html>
<head>上传文件</head>
<body>
<hr>
<form method="post" action="/UploadFileServlet" enctype="multipart/form-data">
<p>文件:<input type = "file" name="FileData" size="20"></p>
<p><input type="submit" value="UpLoad" name="uploadfile"></p>
</form>
</body>
</html>

Answer 6

To: qo(qoo)怎样的用变能的方法，可不可以介绍一下？To: sgr_kk(丝瓜)可以吗？我先试试看！

Answer 7

To:  sgr_kk(丝瓜)  怎么全部看完了，好像没有见到能够处理form中附带的其他附加参数的？？？