唉~，做个Web端的性能测试，第一步遇到的难题就是万恶的图形验证码，大家都知道验证码的处理有以下几点：
1、找个善良乐于助人的开发大大帮忙屏蔽一下验证码
2、如果你和开发大大关系够铁，开个后门，整个万能验证码
3、以上两种都不可以的话，掀桌(╯' - ')╯︵ ┻━┻走人~，
emmmm,开玩笑的，赶紧快马加鞭的gun回来。以上两种如果都不可以的话，咱们只能通过暴力手段，把开发打残了。还是开个玩笑了，毕竟是法制社会呢！言归正传，以上两种都不可以，咱们只能写一个识别验证码的插件了。
主要是参考大神的文章，我只是代码的搬运工https://blog.csdn.net/xreztento/article/details/48682923
一、准备工具
1、Tesseract，图形图像识别工具
2、ApacheJmeter_core.jar，
3、 jorphon.jar
4、logkit-2.0.jar
5、jai-imageio-1.1.jar
6、 swingx-1.6.1.jar
7、eclipse
二、安装Tesseract，将需要用的jar包导入到工程下
三、新建如下类
ImageIOHelper.java
import java.awt.Color;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import java.util.Locale;
import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import javax.imageio.ImageReader;
import javax.imageio.ImageWriteParam;
import javax.imageio.ImageWriter;
import javax.imageio.metadata.IIOMetadata;
import javax.imageio.stream.ImageInputStream;
import javax.imageio.stream.ImageOutputStream;
import com.sun.media.imageio.plugins.tiff.TIFFImageWriteParam;
public class ImageIOHelper{
public static File createImage(File imageFile, String imageFormat) {
File tempFile = null;
ImageInputStream iis = null;
ImageOutputStream ios = null;
ImageReader reader = null;
ImageWriter writer = null;
try {
Iterator<ImageReader> readers = ImageIO.getImageReadersByFormatName(imageFormat);
reader = readers.next();
iis = ImageIO.createImageInputStream(imageFile);
reader.setInput(iis);
IIOMetadata streamMetadata = reader.getStreamMetadata();
TIFFImageWriteParam tiffWriteParam = new TIFFImageWriteParam(Locale.CHINESE);
tiffWriteParam.setCompressionMode(ImageWriteParam.MODE_DISABLED);
Iterator<ImageWriter> writers = ImageIO.getImageWritersByFormatName("tiff");
writer = writers.next();
BufferedImage bi = removeBackgroud(reader.read(0));
IIOImage image = new IIOImage(bi,null,reader.getImageMetadata(0));
tempFile = tempImageFile(imageFile);
ios = ImageIO.createImageOutputStream(tempFile);
writer.setOutput(ios);
writer.write(streamMetadata, image, tiffWriteParam);
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
if(iis != null){
try {
iis.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if(ios != null){
try {
ios.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if(writer != null){
writer.dispose();
}
if(reader != null){
reader.dispose();
}
}
return tempFile;
}
private static File tempImageFile(File imageFile) {
String path = imageFile.getPath();
StringBuffer strB = new StringBuffer(path);
return new File(strB.toString().replaceFirst("jpg", "tif"));
}
public static int isFilter(int colorInt) {
Color color = new Color(colorInt);
if ((color.getRed() > 85 && color.getRed() < 255)
&& (color.getGreen() > 85 && color.getGreen() < 255)
&& (color.getBlue() > 85 && color.getBlue() < 255)) {
return 1;
}
return 0;
}
public static BufferedImage removeBackgroud(BufferedImage img)
throws Exception {
int width = img.getWidth();
int height = img.getHeight();
for (int x = 0; x < width; ++x) {
for (int y = 0; y < height; ++y) {
if (isFilter(img.getRGB(x, y)) == 1) {
img.setRGB(x, y, Color.WHITE.getRGB());
}
}
}
return img;
}
}
OCR.java
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
public class OCR {
private final String LANG_OPTION = "-l";
private final String EOL = System.getProperty("line.separator");
private String tessPath = "D://Tesseract-OCR";
public String recognizeText(File imageFile,String imageFormat) {
File tempImage = ImageIOHelper.createImage(imageFile,imageFormat);
File outputFile = new File(imageFile.getParentFile(),"output" + imageFile.getName());
StringBuffer sb = new StringBuffer();
List<String> cmd = new ArrayList<String>();
cmd.add(tessPath+"//tesseract");
cmd.add("");
cmd.add(outputFile.getName());
cmd.add(LANG_OPTION);
cmd.add("eng");
ProcessBuilder pb = new ProcessBuilder();
pb.directory(imageFile.getParentFile());
cmd.set(1, tempImage.getName());
pb.command(cmd);
pb.redirectErrorStream(true);
Process process = null;
BufferedReader in = null;
int wait;
try {
process = pb.start();
//tesseract.exe xxx.tif 1 -l eng
wait = process.waitFor();
if(wait == 0){
in = new BufferedReader(new InputStreamReader(new FileInputStream(outputFile.getAbsolutePath()+".txt"),"UTF-8"));
String str;
while((str = in.readLine())!=null){
sb.append(str).append(EOL);
}
in.close();
}else{
tempImage.delete();
}
new File(outputFile.getAbsolutePath()+".txt").delete();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
if(in != null){
try {
in.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
tempImage.delete();
return sb.toString();
}
}
VcodeExtractor.java
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.Serializable;
import org.apache.jmeter.processor.PostProcessor;
import org.apache.jmeter.samplers.SampleResult;
import org.apache.jmeter.testelement.AbstractScopedTestElement;
import org.apache.jmeter.threads.JMeterContext;
import org.apache.jmeter.threads.JMeterVariables;
import org.apache.jorphan.logging.LoggingManager;
import org.apache.log.Logger;
public class VcodeExtractor extends AbstractScopedTestElement implements PostProcessor, Serializable{
private static final Logger log = LoggingManager.getLoggerForClass();
public void process() {
// TODO Auto-generated method stub
JMeterContext context = getThreadContext();
SampleResult previousResult = context.getPreviousResult();
if (previousResult == null) {
return;
}
log.debug("VcodeExtractor processing result");
String status = previousResult.getResponseCode();
int id = context.getThreadNum();
String imageName = id + ".jpg";
if(status.equals("200")){
byte[] buffer = previousResult.getResponseData();
FileOutputStream out = null;
File file = null;
try {
file = new File(imageName);
out = new FileOutputStream(file);
out.write(buffer);
out.flush();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
if(out != null){
try {
out.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
try {
String vcode = new OCR().recognizeText(file, "jpg");
vcode = vcode.replace(" ", "").trim();
JMeterVariables var = context.getVariables();
var.put("vcode", vcode);
var.put("vuser", String.valueOf(id));
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
VcodeExtractorGUI.java
import org.apache.jmeter.processor.gui.AbstractPostProcessorGui;
import org.apache.jmeter.testelement.TestElement;
public class VcodeExtractorGUI extends AbstractPostProcessorGui{
public TestElement createTestElement() {
// TODO Auto-generated method stub
VcodeExtractor extractor = new VcodeExtractor();
modifyTestElement(extractor);
return extractor;
}
public String getLabelResource() {
// TODO Auto-generated method stub
return this.getClass().getName();
}
@Override
public String getStaticLabel() {//设置显示名称
// TODO Auto-generated method stub
return "VcodeExtractor";
}
public void modifyTestElement(TestElement extractor) {
// TODO Auto-generated method stub
super.configureTestElement(extractor);
}
}
以上前两个类是图像识别，后两个是Jmeter的UI部分。
四、咱们可以写一个测试类，看一下执行结果是否正确，测试类源码如下
ReadPicture.java
import java.io.File;
import java.io.IOException;
public abstract class ReadPicture {
public static void main(String[] args) throws IOException {
File imageFile = new File("D://123.png");
System.out.println(imageFile.getAbsolutePath());
OCR ocr = new OCR();
String recognizeText = ocr.recognizeText(imageFile, "png");
System.out.println(recognizeText);
}
}
执行测试类，结果如下图
五、生成插件
生成插件，直接在项目右键-> export->Runnable jar file,生成.jar文件。然后将生成的jar文件放在Jmeter的lib文件下的ext文件夹下。然后打开Jmeter，在后置处理器下会有验证码识别的插件。
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