jsp中使用JavaBean出现“引用类不可用”(上传图片).doc

do_upload.jsp Java代码 1. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 文件上传 17. 18. 19. 上传中. 20. % 21. StringuploadPath=application.getRealPath(/upload); 22. StringpicName=null; 23. intwidth=0,height=0; 24. /目标文件夹的路径必须使用绝对路径，不能用相对路径 25. booleanisMultipart=ServletFileUpload.isMultipartContent(request); 26. if(isMultipart=true) 27. try 28. FileItemFactoryfactory=newDiskFileItemFactory(); 29. ServletFileUploadupload=newServletFileUpload(factory); 30. Listitems=upload.parseRequest(request);/得到所有的文件 31. Iteratoritr=items.iterator(); 32. while(itr.hasNext()/依次处理每个文件 33. FileItemitem=(FileItem)itr.next(); 34. StringfileName=item.getName();/获得文件名，包括路径 35. if(fileName!=null) 36. 37. FilefullFile=newFile(item.getName(); 38. picName=fullFile.getName(); 39. FilesavedFile=newFile(uploadPath,fullFile.getName(); 40. item.write(savedFile); 41. 42. 43. out.println(uploadsucceed!); 44. out.println(上传的图片如下：); 45. /分析图片，获取图片的信息 46. pic.setData(picName); 47. session.setAttribute(picture,pic); 48. % 49. 50. 51. 52. 上传的图片如下： 53. 54. 55. imgsrc= 56. 57. 58. 59. 60. 61. 62. 73. 74. 文件上传上传中.%String uploadPath=application.getRealPath(/upload);String picName=null;int width=0,height=0;/目标文件夹的路径必须使用绝对路径，不能用相对路径 boolean isMultipart = ServletFileUpload.isMultipartContent(request); if(isMultipart=true) try FileItemFactory factory = new DiskFileItemFactory(); ServletFileUpload upload = new ServletFileUpload(factory); List items = upload.parseRequest(request);/得到所有的文件 Iterator itr = items.iterator(); while(itr.hasNext()/依次处理每个文件 FileItem item=(FileItem)itr.next(); String fileName=item.getName();/获得文件名，包括路径 if(fileName!=null) File fullFile=new File(item.getName(); picName=fullFile.getName(); File savedFile=new File(uploadPath,fullFile.getName(); item.write(savedFile); out.println(upload succeed!); out.println(上传的图片如下：); /分析图片， 获取图片的信息 pic.setData(picName); session.setAttribute(picture,pic); % 上传的图片如下： img src= PicRgb Java代码 1. packagepicDeal; 2. importjava.awt.*; 3. importjava.awt.image.*; 4. importjava.io.*; 5. 6. importjavax.imageio.*; 7. 8. publicclassPicRgb 9. privateintrData; 10. privateintgData; 11. privateintbData; 12. privateintwidth; 13. privateintheight; 14. /分析图片，参数为图片的名字 15. publicPicRgb() 16. 17. 18. 19. publicvoidsetData(Stringname) 20. Imageimage=null; 21. try 22. Filesourceimage=newFile(upload/+name); 23. image=ImageIO.read(sourceimage); 24. 25. catch(IOExceptione) 26. 27. /读取图像的高度&宽度 28. this.width=image.getWidth(null); 29. this.height=image.getHeight(null); 30. System.out.println(width); 31. System.out.println(height); 32. /读取图片像素信息 33. Imageim=Toolkit.getDefaultToolkit().getImage(upload/+name); 34. this.rData=newint256; 35. this.gData=newint256; 36. this.bData=newint256; 37. intpixels=newintwidth*height; 38. try 39. PixelGrabberpg=newPixelGrabber(im,0,0,width,height,pixels,0,width); 40. pg.grabPixels(); 41. catch(InterruptedExceptione) 42. e.printStackTrace(); 43. 44. ColorModelcm=ColorModel.getRGBdefault(); 45. intred,green,blue; 46. for(inti=0;iwidth*height;i+) 47. red=cm.getRed(pixelsi); 48. this.rDatared+; 49. green=cm.getGreen(pixelsi); 50. this.gDatagreen+; 51. blue=cm.getBlue(pixelsi); 52. this.bDatablue+; 53. 54. 55. publicvoidsetRData(intr) 56. 57. this.rData=r; 58. 59. publicvoidsetGData(intg) 60. 61. this.gData=g; 62. 63. publicvoidsetBData(intb) 64. 65. this.bData=b; 66. 67. publicvoidsetWidth(intw) 68. 69. this.width=w; 70. 71. publicvoidsetHeight(inth) 72. 73. this.height=h; 74. 75. publicintgetWidth() 76. 77. returnthis.width; 78. 79. publicintgetHeight() 80. 81. returnthis.height; 82. 83. publicintgetRData() 84. 85. returnthis.rData; 86. 87. publicintgetGData() 88. 89. returnthis.gData; 90. 91. publicintgetBData() 92. 93. returnthis.bData; 94. 95. package picDeal;import java.awt.*;import java.awt.image.*;import java.io.*;import javax.imageio.*;public class PicRgb private int rData;private int gData;private int bData;private int width;private int height;/分析图片，参数为图片的名字public PicRgb()public void setData(String name)Image image=null;tryFile sourceimage = new File(upload/+name);image=ImageIO.read(sourceimage);catch(IOException e)/读取图像的高度&宽度this.width=image.getWidth(null);this.height=image.getHeight(null);System.out.println(width);System.out.println(height);/读取图片像素信息Image im=Toolkit.getDefaultToolkit().getImage(upload/+name);this.rData=new int256;this.gData=new int256;this.bData=new int256;int pixels=new intwidth*height;tryPixelGrabber pg=new PixelGrabber(im,0,0,width,height,pixels,0,width);pg.grabPixels();catch(InterruptedException e)e.printStackTrace();ColorModel cm=ColorModel.getRGBdefault();int red,green,blue;for(int i=0;iwidth*height;i+)red=cm.getRed(pixelsi);this.rDatared+;green=cm.getGreen(pixelsi);this.gDatagreen+;blue=cm.getBlue(pixelsi); this.bDatablue+;public void setRData(int r)this.rData=r;public void setGData(int g)this.gData=g;public void setBData(int b)this.bData=b;public void setWidth(int w)this.width=w;public void setHeight(int h)this.height=h;public int getWidth()return this.width;public int getHeight()return this.height;public int getRData()return this.rData;public int getGData()return this.gData;public int getBData()return this.bData;当使用up_load.jsp页面时 出现错误 提示 useBean使用的类不可用弄了一下午，头都大了 - - 采纳的答案2009-05-18 studying_ (资深程序员) 你的pic 这个类不可用。因为你还加上 Java代码 1. 其中： PicRgb 这个类的方法名要不能带参数，默认为getXXX(). 其中XXX的第一个单词要大写。因为这是jsp:useBean 约定写法。 demo.jsp: Java代码 1. 2. 3. 4. 5. insert 6. 7. id: 8. sname: 9. price: 10. acount: 11. submit 12. 13. 14. 15. 16. 17. id 18. 19. 20. sname 21. 22. 23. price 24. 25. 26. acount 27. 28. 29. 30. 31. 32. 33. 34. 35. 36. 37. 38. 39. 40. 41. 42. 43. 44. 45. 46. 47. 48. 49. insert id: sname: price: acount: submitidsnamepriceacountJava代码 1. publicclassStockDao 2. privateAccessaccess; 3. /privateStockstock; 4. privateResultS