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基于Tesseract-OCR实现的JAVA WEB版OCR(图片转文字)

2014-03-06 11:49 387 查看

首先在Tesseract-OCR官网下载Tesseract-OCR 3.02，以及中文数据包chi_sim.traineddata(简体)

接下来就是新建一个JAVA EE项目，把Tesseract-OCR放在项目WebRoot下。

下面是主要代码：

接受客户端上传过来的图片，使用Tesseract-OCR识别后返回至前台。

package servlet;

import java.io.IOException;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import util.FileUtil;
import util.OCRUtil;

import com.jspsmart.upload.File;
import com.jspsmart.upload.SmartUpload;
import com.jspsmart.upload.SmartUploadException;

public class OCRServlet extends HttpServlet {

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setCharacterEncoding("gbk");
SmartUpload upload = new SmartUpload();
ServletConfig sc = this.getServletConfig();
upload.initialize(sc, request, response);
File file = null;
long size = 5*1024*1024;
upload.setAllowedFilesList("gif,jpg,bmp,png");
upload.setMaxFileSize(size);
upload.setCharset("GBK");
try {
upload.upload();
file = upload.getFiles().getFile(0);
String userPath = "upload\\"+request.getRemoteAddr().replaceAll("\\.", "")+"\\";
String svpath = userPath+file.getFileName();
if(!file.isMissing()){
String realPath = request.getRealPath("/");
FileUtil.creatPath(realPath+userPath);
file.saveAs(svpath,SmartUpload.SAVE_VIRTUAL);
try {
OCRUtil.runOCR(realPath, realPath+svpath, realPath+userPath+"ocr",true);
request.setAttribute("txt", FileUtil.read(realPath+userPath+"ocr.txt").trim());
request.getRequestDispatcher("/index.jsp").forward(request, response);
} catch (Exception e) {
e.printStackTrace();
}
FileUtil.delete(realPath+userPath);
}
} catch (SmartUploadException e) {
e.printStackTrace();
}
}

}

package util;

public class OCRUtil {
public static String chiSIM = "chi_sim";

public static void runOCR(String realPath,String imagePath,String outPath,boolean isChi) throws Exception{
Runtime r = Runtime.getRuntime();
String cmd = "\""+realPath+"Tesseract-OCR\\tesseract.exe\" \""+imagePath+"\" \""+outPath+"\" -l "+(isChi?chiSIM:"");
r.exec(cmd);
}
}

package util;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;

public class FileUtil {
public static String read(String path) throws IOException{
String txt = "";
File file = new File(path);
long timeout = 30*60;
while(!(file.isFile() && file.exists())){
file = new File(path);
try {
Thread.sleep(100);
timeout -= 100;
} catch (InterruptedException e) {
e.printStackTrace();
}
}
if (file.isFile() && file.exists()) {
InputStreamReader read = new InputStreamReader(new FileInputStream(file), "UTF-8");
BufferedReader bReader = new BufferedReader(read);
String temptxt = "";
txt = "";
while((temptxt=bReader.readLine())!=null){
txt += temptxt;
}
bReader.close();
read.close();
}
return txt;
}

public static void creatPath(String path) throws IOException{
File file = new File(path);
file.mkdir();
}

public static void delete(String path) throws IOException{
File file = new File(path);
String[] list = file.list();
File tempFile = null;
for(String temp : list){
tempFile = new File(path+temp);
tempFile.delete();
}
file.delete();
}
}

下面是JSP代码：

<%@ page language="java" import="java.util.*" pageEncoding="GBK"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>在线OCR--By Lee</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--a
<link rel="stylesheet" type="text/css" href="styles.css">
-->

</head>
<script type="text/javascript">
function check(){
var path = document.getElementById("image").value;
if(path.length==0){
alert("请选择要导入的图片！");
return false;
}
if(!(path.match(/.jpg$/i)||path.match(/.bmp$/i)||path.match(/.gif$/i)||path.match(/.png$/i))){
alert("只支持JPG,BMP,GIF,PNG格式！");
return false;
}
return true;
}
</script>
<body>
<form enctype="multipart/form-data" method="post" action="OCRServlet" onsubmit="return check();">
选择文件：<input type="file" id="image" name="image"><br/>
上传文件：<input type="submit" value="提交上传">
</form>
<textarea rows="20" cols="60"><%Object txt = request.getAttribute("txt");
if(txt!=null&&txt.toString().length()==0){
out.print("未识别出任何文字！");
}else if(txt!=null){
out.print(txt.toString());
}
%></textarea>
</body>
</html>

效果图：

在图片没做任何处理的情况下，识别率还是挺低的。。

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标签： OCR JAVA WEB

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