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分享An exception occurred processing JSP page /index.jsp at line 31
25: <jsp:useBean id="Base64_tu" class="test.Base64_tu" scope="page" />
26: <%
27: String f1 = "d:\\111.jpg";
28: String f2 = "d:\\222.jpg";
29: out.print(f1);
30: out.print(f2);
31: String strImg = Base64_tu.GetImageStr( f1 );
32: Base64_tu.GenerateImage(strImg,f2 );
33: out.print(strImg);
34: %>
报错：An exception occurred processing JSP page /index.jsp at line 31
26: <%
27: String f1 = "d:\\111.jpg";
28: String f2 = "d:\\222.jpg";
29: out.print(f1);
30: out.print(f2);
31: String strImg = Base64_tu.GetImageStr( f1 );
32: Base64_tu.GenerateImage(strImg,f2 );
33: out.print(strImg);
34: %>
报错：An exception occurred processing JSP page /index.jsp at line 31
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坏朋朋 2017-04-27
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将1楼的Base64_tu.java代码编译为Base64_tu.class,放在 index.jsp 的 WEB-INF 下的classes下的test目录下。
如果把：
public static String GetImageStr(String imgFile)
{ //String imgFile = "d:\\111.jpg";//待处理的图片
改成：
public static String GetImageStr()
{ String imgFile = "d:\\111.jpg";//待处理的图片
在JSP页面也直接调用无参数函数则执行正常。
坏朋朋 2017-04-27
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回复楼上，web容器是tomcat，错误页面如下:
HTTP Status 500 - An exception occurred processing JSP page /index.jsp at line 31
type Exception report
message An exception occurred processing JSP page /index.jsp at line 31
description The server encountered an internal error that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: An exception occurred processing JSP page /index.jsp at line 31
28: String f2 = "d:\\222.jpg";
29: out.print(f1);
30: out.print(f2);
31: String strImg = Base64_tu.GetImageStr( f1 );
32: Base64_tu.GenerateImage(strImg,f2 );
33: out.print(strImg);
34: %>
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:588)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:466)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
root cause
javax.servlet.ServletException: java.lang.NoSuchMethodError: test.Base64_tu.GetImageStr(Ljava/lang/String;)Ljava/lang/String;
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:909)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:838)
org.apache.jsp.index_jsp._jspService(index_jsp.java:182)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:443)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
root cause
java.lang.NoSuchMethodError: test.Base64_tu.GetImageStr(Ljava/lang/String;)Ljava/lang/String;
org.apache.jsp.index_jsp._jspService(index_jsp.java:164)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:443)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
note The full stack trace of the root cause is available in the Apache Tomcat/9.0.0.M9 logs.
李德胜1995 2017-04-27
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有没有具体点的异常？？？
坏朋朋 2017-04-27
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如果把：
public static String GetImageStr(String imgFile)
{//将图片文件转化为字节数组字符串，并对其进行Base64编码处理
//String imgFile = "d:\\111.jpg";//待处理的图片
改成：
public static String GetImageStr()
{//将图片文件转化为字节数组字符串，并对其进行Base64编码处理
String imgFile = "d:\\111.jpg";//待处理的图片
在JSP页面也直接调用无参数函数则执行正常。
坏朋朋 2017-04-27
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//Base64_tu.java
package test;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
public class Base64_tu
{
public static void main(String[] args)
{
// String strImg = GetImageStr('d:\\111.jpg');
// GenerateImage(strImg,'d:\\222.jpg');
}
public static String GetImageStr(String imgFile)
{//将图片文件转化为字节数组字符串，并对其进行Base64编码处理
//String imgFile = "d:\\111.jpg";//待处理的图片
InputStream in = null;
byte[] data = null;
//读取图片字节数组
try
{
in = new FileInputStream(imgFile);
data = new byte[in.available()];
in.read(data);
in.close();
}
catch (IOException e)
{
e.printStackTrace();
}
//对字节数组Base64编码
BASE64Encoder encoder = new BASE64Encoder();
return encoder.encode(data);//返回Base64编码过的字节数组字符串
}
public static boolean GenerateImage(String imgStr,String imgFilePath)
{//对字节数组字符串进行Base64解码并生成图片
if (imgStr == null) //图像数据为空
return false;
BASE64Decoder decoder = new BASE64Decoder();
try
{
//Base64解码
byte[] b = decoder.decodeBuffer(imgStr);
for(int i=0;i<b.length;++i)
{
if(b[i]<0)
{//调整异常数据
b[i]+=256;
}
}
//生成jpeg图片
//String imgFilePath = "d:\\222.jpg";//新生成的图片
OutputStream out = new FileOutputStream(imgFilePath);
out.write(b);
out.flush();
out.close();
return true;
}
catch (Exception e)
{
return false;
}
}
}
坏朋朋 2017-04-27
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//用J下面的main()执行也成功了：
public static void main(String args[])
{ String file1 = "d:\\111.jpg";
String file2 = "d:\\222.jpg";
String strImg = GetImageStr( file1 );
GenerateImage(strImg, file2 );
}
李德胜1995 2017-04-27
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ava.lang.NoSuchMethodError: test.Base64_tu.GetImageStr(Ljava/lang/String;)Ljava/lang/String;异常表示没有GetImageStr(String imgFile)这个方法，把工程clean一下，重新部署到tomcat试试
