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用jspsmartupload组件上传初始化出错，高分求解

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用jspsmartupload组件上传初始化出错，高分求解

发表于：2007-06-06 10:32:39 楼主

在servlet中
pagecontext pagecontext = null;
smartupload su = new smartupload（);
su.initialize（pagecontext);//上传初始化
到这一步会给出这样的错误:
standardwrappervalve[file_upload_download]: servlet.service（) for servlet file_upload_download threw exception

java.lang.nullpointerexception

java.lang.nullpointerexception

at com.jspsmart.upload.smartupload.initialize（smartupload.java:136)

发表于：2007-06-06 10:39:121楼得分:0

空指针异常。。。
你把pagecontext初始化的值为null，然后再对这个值进行操作，就会产生空指针异常啦。。。
帮顶。。。

发表于：2007-06-06 10:57:132楼得分:0

给你段代码自己分析
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import com.jspsmart.upload.*;

public class servletupload extends httpservlet {

private servletconfig config;
/**
* init the servlet
*/
final public void init（servletconfig config) throws servletexception {
this.config = config;
}

final public servletconfig getservletconfig（) {
return config;
}
/**
* handles get requests
*/
public void doget（httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {

printwriter out = response.getwriter（);
out.println（ " <html> ");
out.println（ " <body bgcolor= 'white '> ");
out.println（ " <h1> jspsmartupload : servlet sample </h1> ");
out.println（ " <hr> <br> ");
out.println（ "the method of the html form must be post. ");
out.println（ " </body> ");
out.println（ " </html> ");
}

/**
* handles post requests
*/
protected void dopost（httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {

printwriter out = response.getwriter（);
out.println（ " <html> ");
out.println（ " <body bgcolor= 'white '> ");
out.println（ " <h1> jspsmartupload : servlet sample </h1> ");
out.println（ " <hr> ");

// variables
int count=0;
smartupload mysmartupload = new smartupload（);

try {
// initialization
mysmartupload.initialize（config,request,response);

// upload
mysmartupload.upload（);

// save the file with the original name
// in a virtual path of the web server
count = mysmartupload.save（mysmartupload.getrequest（).getparameter（ "path "));

// display the result
out.println（count + " file uploaded. ");

} catch （exception e){
out.println（ "unable to upload the file. <br> ");
out.println（ "error : " + e.tostring（));
}

out.println（ " </body> ");
out.println（ " </html> ");
}
/**
* destroy the servlet
*/
public void destroy （) {
}

}

注意前面的servletconfig config;

发表于：2007-06-22 15:34:373楼得分:0

发表于：2007-06-22 17:53:194楼得分:0

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发表于：2007-07-04 16:36:465楼得分:0

该回复于2007-12-28 12:03:54被管理员或版主删除

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