ofbiz——上传工具类HttpRequestFileUpload修改优化
来源：互联网 发布：22周排畸b超数据看男女 编辑：程序博客网 时间：2024/06/14 01:50
在使用HttpRequestFileUpload类实现文件上传功能时，发现单用户没有选择上传文件时，执行uploadObject.doUpload(request);方法时会报错，所以进行了优化。
主要添加了一个Map<String, File> fileMap;成员。当用户没有上传文件时，其uploadObject.getFile("file控件name")对于获取的值为null。
当用户上传多个文件，也会解析保存到fileMap中，之前的实现上传多个文件则无法判断上传了几个文件。
org.apache.ofbiz.base.util.HttpRequestFileUpload类
原来的实现代码：
package org.apache.ofbiz.base.util;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.util.Date;import java.util.HashMap;import java.util.Map;import javax.servlet.ServletInputStream;import javax.servlet.http.HttpServletRequest;/** * HttpRequestFileUpload - Receive a file upload through an HttpServletRequest * */public class HttpRequestFileUpload { private int BUFFER_SIZE = 4096; private int WAIT_INTERVAL = 200; // in milliseconds private int MAX_WAITS = 20; private int waitCount = 0; private String savePath; private String filepath; private String filename; private String contentType; private String overrideFilename = null; private Map<String, String> fields; public String getOverrideFilename() { return overrideFilename; } public void setOverrideFilename(String ofName) { overrideFilename = ofName; } public String getFilename() { return filename; } public String getFilepath() { return filepath; } public void setSavePath(String savePath) { this.savePath = savePath; } public String getContentType() { return contentType; } public String getFieldValue(String fieldName) { if (fields == null || fieldName == null) return null; return fields.get(fieldName); } private void setFilename(String s) { if (s == null) return; int pos = s.indexOf("filename=\""); if (pos != -1) { filepath = s.substring(pos + 10, s.length() - 1); // Windows browsers include the full path on the client // But Linux/Unix and Mac browsers only send the filename // test if this is from a Windows browser pos = filepath.lastIndexOf("\\"); if (pos != -1) filename = filepath.substring(pos + 1); else filename = filepath; } } private void setContentType(String s) { if (s == null) return; int pos = s.indexOf(": "); if (pos != -1) contentType = s.substring(pos + 2, s.length()); } public void doUpload(HttpServletRequest request) throws IOException { ServletInputStream in = request.getInputStream(); String reqLengthString = request.getHeader("content-length"); System.out.println("expect " + reqLengthString + " bytes."); int requestLength = 0; try { requestLength = Integer.valueOf(reqLengthString).intValue(); } catch (Exception e2) { e2.printStackTrace(); return; } byte[] line = new byte[BUFFER_SIZE]; int i = -1; i = waitingReadLine(in, line, 0, BUFFER_SIZE, requestLength); requestLength -= i; if (i < 3) return; int boundaryLength = i - 2; String boundary = new String(line, 0, boundaryLength); // -2 discards the newline character System.out.println("boundary=[" + boundary + "] length is " + boundaryLength); fields = new HashMap<String, String>(); while (requestLength > 0/* i != -1*/) { String newLine = ""; if (i > -1) { newLine = new String(line, 0, i); } if (newLine.startsWith("Content-Disposition: form-data; name=\"")) { if (newLine.indexOf("filename=\"") != -1) { setFilename(new String(line, 0, i - 2)); if (filename == null) return; // this is the file content i = waitingReadLine(in, line, 0, BUFFER_SIZE, requestLength); requestLength -= i; setContentType(new String(line, 0, i - 2)); // blank line i = waitingReadLine(in, line, 0, BUFFER_SIZE, requestLength); requestLength -= i; newLine = new String(line, 0, i); String filenameToUse = filename; if (overrideFilename != null) { filenameToUse = overrideFilename; } // first line of actual file i = waitingReadLine(in, line, 0, BUFFER_SIZE, requestLength); requestLength -= i; newLine = new String(line, 0, i); byte[] lastTwoBytes = new byte[2]; if (i > 1) { lastTwoBytes[0] = line[i - 2]; lastTwoBytes[1] = line[i - 1]; } System.out.println("about to create a file:" + (savePath == null ? "" : savePath) + filenameToUse); // before creating the file make sure directory exists File savePathFile = new File(savePath); if (!savePathFile.exists()) { savePathFile.mkdirs(); } FileOutputStream fos = new FileOutputStream((savePath == null ? "" : savePath) + filenameToUse); boolean bail = (new String(line, 0, i).startsWith(boundary)); boolean oneByteLine = (i == 1); // handle one-byte lines while ((requestLength > 0/* i != -1*/) && !bail) { // write the current buffer, except the last 2 bytes; if (i > 1) { fos.write(line, 0, i - 2); } oneByteLine = (i == 1); // we need to track on-byte lines differently i = waitingReadLine(in, line, 0, BUFFER_SIZE, requestLength); requestLength -= i; // the problem is the last line of the file content // contains the new line character. // if the line just read was the last line, we're done. // if not, we must write the last 2 bytes of the previous buffer // just assume that a one-byte line isn't the last line if (requestLength < 1) { bail = true; } else if (oneByteLine) { fos.write(lastTwoBytes, 0, 1); // we only saved one byte } else { fos.write(lastTwoBytes, 0, 2); } if (i > 1) { // save the last 2 bytes of the buffer lastTwoBytes[0] = line[i - 2]; lastTwoBytes[1] = line[i - 1]; } else { lastTwoBytes[0] = line[0]; // only save one byte } } fos.flush(); fos.close(); } else { // this is a field // get the field name int pos = newLine.indexOf("name=\""); String fieldName = newLine.substring(pos + 6, newLine.length() - 3); // blank line i = waitingReadLine(in, line, 0, BUFFER_SIZE, requestLength); requestLength -= i; i = waitingReadLine(in, line, 0, BUFFER_SIZE, requestLength); requestLength -= i; newLine = new String(line, 0, i); StringBuilder fieldValue = new StringBuilder(BUFFER_SIZE); while (requestLength > 0/* i != -1*/ && !newLine.startsWith(boundary)) { // The last line of the field // contains the new line character. // So, we need to check if the current line is // the last line. i = waitingReadLine(in, line, 0, BUFFER_SIZE, requestLength); requestLength -= i; if ((i == boundaryLength + 2 || i == boundaryLength + 4) // + 4 is eof && (new String(line, 0, i).startsWith(boundary))) fieldValue.append(newLine.substring(0, newLine.length() - 2)); else fieldValue.append(newLine); newLine = new String(line, 0, i); } fields.put(fieldName, fieldValue.toString()); } } i = waitingReadLine(in, line, 0, BUFFER_SIZE, requestLength); if (i > -1) { requestLength -= i; } } // end while } // reads a line, waiting if there is nothing available and reqLen > 0 private int waitingReadLine(ServletInputStream in, byte[] buf, int off, int len, int reqLen) throws IOException { int i = -1; while (((i = in.readLine(buf, off, len)) == -1) && (reqLen > 0)) { System.out.print("waiting"); if (waitCount > MAX_WAITS) { System.out.println("waited " + waitCount + " times, bailing out while still expecting " + reqLen + " bytes."); throw new IOException("waited " + waitCount + " times, bailing out while still expecting " + reqLen + " bytes."); } waitCount++; long endMS = new Date().getTime() + WAIT_INTERVAL; while (endMS > (new Date().getTime())) { try { wait(WAIT_INTERVAL); } catch (Exception e3) { System.out.print("."); } } System.out.println((new Date().getTime() - endMS) + " ms"); } return i; }}修改后实现代码：
package org.apache.ofbiz.base.util;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.util.Date;import java.util.HashMap;import java.util.Map;import javax.servlet.ServletInputStream;import javax.servlet.http.HttpServletRequest;/** * HttpRequestFileUpload - Receive a file upload through an HttpServletRequest * */public class HttpRequestFileUpload { private int BUFFER_SIZE = 4096; private int WAIT_INTERVAL = 200; // in milliseconds private int MAX_WAITS = 20; private int waitCount = 0; private String savePath; private String filepath; private String filename; private String contentType; private String overrideFilename = null; private Map<String, String> fields;private Map<String, File> fileMap; public String getOverrideFilename() { return overrideFilename; } public void setOverrideFilename(String ofName) { overrideFilename = ofName; } public String getFilename() { return filename; } public String getFilepath() { return filepath; } public void setSavePath(String savePath) { this.savePath = savePath; } public String getContentType() { return contentType; } public String getFieldValue(String fieldName) { if (fields == null || fieldName == null) return null; return fields.get(fieldName); }public File getFile(String fieldName) {if (fileMap == null || fieldName == null) return null; return fileMap.get(fieldName); } private void setFilename(String s) { if (s == null) return; int pos = s.indexOf("filename=\""); if (pos != -1) { filepath = s.substring(pos + 10, s.length() - 1); // Windows browsers include the full path on the client // But Linux/Unix and Mac browsers only send the filename // test if this is from a Windows browser pos = filepath.lastIndexOf("\\"); if (pos != -1) filename = filepath.substring(pos + 1); else filename = filepath; } } private void setContentType(String s) { if (s == null) return; int pos = s.indexOf(": "); if (pos != -1) contentType = s.substring(pos + 2, s.length()); } public void doUpload(HttpServletRequest request) throws IOException { ServletInputStream in = request.getInputStream(); String reqLengthString = request.getHeader("content-length"); System.out.println("expect " + reqLengthString + " bytes."); int requestLength = 0; try { requestLength = Integer.valueOf(reqLengthString).intValue(); } catch (Exception e2) { e2.printStackTrace(); return; } byte[] line = new byte[BUFFER_SIZE]; int i = -1; i = waitingReadLine(in, line, 0, BUFFER_SIZE, requestLength); requestLength -= i; if (i < 3) return; int boundaryLength = i - 2; String boundary = new String(line, 0, boundaryLength); // -2 discards the newline character System.out.println("boundary=[" + boundary + "] length is " + boundaryLength); fields = new HashMap<String, String>();fileMap = new HashMap<String, File>(); while (requestLength > 0/* i != -1*/) { String newLine = ""; if (i > -1) { newLine = new String(line, 0, i); } if (newLine.startsWith("Content-Disposition: form-data; name=\"")) { if (newLine.indexOf("filename=\"") != -1) {int pos = newLine.indexOf("name=\"");String fieldName = newLine.substring(pos + 6, newLine.indexOf("\"", pos + 6 ));setFilename(new String(line, 0, i - 2));if("".equals(filename) || filename == null){fileMap.put(fieldName, null);}else{// this is the file contenti = waitingReadLine(in, line, 0, BUFFER_SIZE, requestLength);requestLength -= i;setContentType(new String(line, 0, i - 2));// blank linei = waitingReadLine(in, line, 0, BUFFER_SIZE, requestLength);requestLength -= i;newLine = new String(line, 0, i);String filenameToUse = filename;if (overrideFilename != null) {filenameToUse = overrideFilename;}// first line of actual filei = waitingReadLine(in, line, 0, BUFFER_SIZE, requestLength);requestLength -= i;newLine = new String(line, 0, i);byte[] lastTwoBytes = new byte[2];if (i > 1) {lastTwoBytes[0] = line[i - 2];lastTwoBytes[1] = line[i - 1];}System.out.println("about to create a file:" + (savePath == null ? "" : savePath) + filenameToUse);// before creating the file make sure directory existsFile savePathFile = new File(savePath);if (!savePathFile.exists()) {savePathFile.mkdirs();}FileOutputStream fos = new FileOutputStream((savePath == null ? "" : savePath) + filenameToUse);boolean bail = (new String(line, 0, i).startsWith(boundary));boolean oneByteLine = (i == 1); // handle one-byte lineswhile ((requestLength > 0/* i != -1*/) && !bail) {// write the current buffer, except the last 2 bytes;if (i > 1) {fos.write(line, 0, i - 2);}oneByteLine = (i == 1); // we need to track on-byte lines differentlyi = waitingReadLine(in, line, 0, BUFFER_SIZE, requestLength);requestLength -= i;// the problem is the last line of the file content// contains the new line character.// if the line just read was the last line, we're done.// if not, we must write the last 2 bytes of the previous buffer// just assume that a one-byte line isn't the last lineif (requestLength < 1) {bail = true;} else if (oneByteLine) {fos.write(lastTwoBytes, 0, 1); // we only saved one byte} else {fos.write(lastTwoBytes, 0, 2);}if (i > 1) {// save the last 2 bytes of the bufferlastTwoBytes[0] = line[i - 2];lastTwoBytes[1] = line[i - 1];} else {lastTwoBytes[0] = line[0]; // only save one byte}}fos.flush();fos.close();fileMap.put(fieldName, new File((savePath == null ? "" : savePath) + filenameToUse));} } else { // this is a field // get the field name int pos = newLine.indexOf("name=\""); String fieldName = newLine.substring(pos + 6, newLine.length() - 3); // blank line i = waitingReadLine(in, line, 0, BUFFER_SIZE, requestLength); requestLength -= i; i = waitingReadLine(in, line, 0, BUFFER_SIZE, requestLength); requestLength -= i; newLine = new String(line, 0, i); StringBuilder fieldValue = new StringBuilder(BUFFER_SIZE); while (requestLength > 0/* i != -1*/ && !newLine.startsWith(boundary)) { // The last line of the field // contains the new line character. // So, we need to check if the current line is // the last line. i = waitingReadLine(in, line, 0, BUFFER_SIZE, requestLength); requestLength -= i; if ((i == boundaryLength + 2 || i == boundaryLength + 4) // + 4 is eof && (new String(line, 0, i).startsWith(boundary))) fieldValue.append(newLine.substring(0, newLine.length() - 2)); else fieldValue.append(newLine); newLine = new String(line, 0, i); } fields.put(fieldName, fieldValue.toString()); } } i = waitingReadLine(in, line, 0, BUFFER_SIZE, requestLength); if (i > -1) { requestLength -= i; } } // end while } // reads a line, waiting if there is nothing available and reqLen > 0 private int waitingReadLine(ServletInputStream in, byte[] buf, int off, int len, int reqLen) throws IOException { int i = -1; while (((i = in.readLine(buf, off, len)) == -1) && (reqLen > 0)) { System.out.print("waiting"); if (waitCount > MAX_WAITS) { System.out.println("waited " + waitCount + " times, bailing out while still expecting " + reqLen + " bytes."); throw new IOException("waited " + waitCount + " times, bailing out while still expecting " + reqLen + " bytes."); } waitCount++; long endMS = new Date().getTime() + WAIT_INTERVAL; while (endMS > (new Date().getTime())) { try { wait(WAIT_INTERVAL); } catch (Exception e3) { System.out.print("."); } } System.out.println((new Date().getTime() - endMS) + " ms"); } return i; }}阅读全文
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