实例简介HttpUnit结合JUnit自动测试Web应用

本文通过实例来讲解如何通过 HttpUnit来对web应用进行测试,尤其是当下Ajax越来越流行的情况下,http request和response交互频繁,里面传输的内容也以Json或者XML为主,用HttpUnit结合JUnit来做测试可以带来很多好处,甚至是在web页面还不存在的情况下,通过模拟http请求,包括模拟上传文件,就可以用来测试服务端的servlet,action(有httprequest参数)等代码.

JAVA实例代码

HTTPStub :包装了HttpUnit提供的一些类,同时在初始化的时候做login验证,WebConversation会维护session的信息.
public class HTTPStub {
private WebConversation httpConversation;
private PostMethodWebRequest httpRequest;

public HTTPStub() {
httpConversation = new WebConversation();
String urlLogin = EnvConstant.SERVER_CTXT + EnvConstant.SERVER_LOGINURL;
GetMethodWebRequest getReq = new GetMethodWebRequest(urlLogin);
try {
httpConversation.getResponse(getReq);
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
} catch (SAXException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}

public void initHttpRequest(String url) {
httpRequest = new PostMethodWebRequest(EnvConstant.SERVER_CTXT + url, true);
}

public void setParameter(String name, String value) {
httpRequest.setParameter(name, value);
}

public void setFile(String Filename) {
InputStream inputStream = FileUtil.readFromdefaultClspath(Filename);
httpRequest.selectFile("dumyfile", "dumyfile.csv", inputStream, "text/plain");
}

public WebResponse getHttpResponse() {
try {
return httpConversation.getResponse(httpRequest);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SAXException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}

public String getHttpResponseContents() {
try {
WebResponse resp = httpConversation.getResponse(httpRequest);

StringBuffer strbf = new StringBuffer();

BufferedReader in = new BufferedReader(new InputStreamReader(resp.getInputStream()));
String str;
while ((str = in.readLine()) != null) {
strbf.append(str);
}
in.close();

return strbf.toString();

} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SAXException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

return null;
}

}

对inputstream处理的一个util类:
public class FileUtil {
public static InputStream readFromdefaultClspath(String fileName) {

InputStream stream = ClassLoader.getSystemResourceAsStream(fileName);
return stream;

}

public static String getContentsFromFile(String fileName) {

InputStream stream = readFromdefaultClspath(fileName);
StringBuffer strbf = new StringBuffer();
try {
BufferedReader in = new BufferedReader(new InputStreamReader(stream));
String str;
while ((str = in.readLine()) != null) {
strbf.append(str);
}
in.close();
} catch (IOException e) {
e.printStackTrace();
}

return strbf.toString();

}

}

Junit测试类:

public class ActionCopyBillTest {
private HTTPStub httpStub;

@Before
public void setUp() throws Exception {
httpStub = new HTTPStub();
}

@After
public void tearDown() throws Exception {
}

@Test
public void testPerform() {
httpStub.initHttpRequest("FrontController?command=CopyBill");

httpStub.setParameter("bm_cb_dtCategory", "Copy Bill Request");
httpStub.setParameter("bm_cb_SRID", "SR0001");
httpStub.setParameter("bm_cb_ItemOpt", "2- Custom Itemisation");
httpStub.setParameter("bm_cb_BillLanCode", "ENG");
httpStub.setParameter("bm_cb_LegendPrs", "Copy Legend");
httpStub.setParameter("bm_cb_BillStruct", "Front Page Only");
httpStub.setParameter("bm_cb_ItemThd", "1");
httpStub.setParameter("bm_cb_BillMedia", "Paper Bill");
httpStub.setParameter("bm_cb_BillFormat", "Blue Bill");

httpStub.setFile("testdata/req/CopyBill_1.csv");

String respContents = httpStub.getHttpResponseContents();

String ritContents = FileUtil.getContentsFromFile("testdata/rep/CopyBill_1.rsp");

Assert.assertEquals(respContents, ritContents);
}

}

如果想对response进行验证,可以通过手工从html页面输入数据,提交请求,用工具(如eclipse带有的插件tcp/ip monitor)将response截取下来保存为文件,然后和junit测试的时候的response对比.

另外,返回的response也提供了一系列方法来操作其包含的内容:

1,如返回的是文本,可以通过resp.getText()获取,如果文本是json格式,可以再进一步构造成jsonobject来操作.

String respContents = resp.getText();
JSONObject json = new JSONObject(respContents);
System.out.println(json.getInt("total"));
JSONArray arr = json.getJSONArray("userdata");
System.out.println(arr.get(0));

2,如果返回的是XML(标准结构的html也是合法的XML),可以得到w3c 的document对象,resp.getDOM();

3,如果返回的是html页面,WebResponse提供了一组类似于Javascript操作html dom的方法.

resp.getElementWithID(id)

resp.getTables();

...

可以在http://httpunit.sourceforge.net/doc/cookbook.html找到更详细的信息.