介绍
之前在邮政实习时，leader让我阅读tomcat的源代码，尝试自己实现远程部署项目的功能，于是便有了这此实践。
在Tomact中有一个Manager应用程序，它是用来管理已经部署的web应用程序，在这个应用程序中，ManagerServlet是他的主servlet，通过它我们可以获取tomcat的部分指标，远程管理web应用程序，不过这个功能会受到web应用程序部署中安全约束的保护。
当你请求ManagerServlet时，它会检查getPathInfo()返回的值以及相关的查询参数，以确定被请求的 *** 作。它支持以下 *** 作和参数(从servlet路径开始):
请求路径
描述
我们可以通过ManagerServlet中getPathInfo()提供的 *** 作，将自己的项目远程部署到服务器上，下面将贴出我的实践代码，在实践它之前你只需要引入httpclient包和commons包。
封装统一的远程请求管理类
封装此类用于方便client请求ManagerServlet：
import java.io.File;
import java.net.URL;
import java.net.URLEncoder;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang.StringUtils;
import org.apache.http.Header;
import org.apache.http.HttpHost;
import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.Credentials;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.AuthCache;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpRequestBase;
import org.apache.http.client.protocol.ClientContext;
import org.apache.http.impl.auth.BasicScheme;
import org.apache.http.impl.client.BasicAuthCache;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.conn.PoolingClientConnectionManager;
import org.apache.http.protocol.BasicHttpContext;
public class TomcatManager {
private static final String MANAGER_CHARSET = "UTF-8";
private String username;
private URL url;
private String password;
private String charset;
private boolean verbose;
private DefaultHttpClient httpClient;
private BasicHttpContext localContext;
/** constructor */
public TomcatManager(URL url, String username) {
this(url, username, "");
}
public TomcatManager(URL url, String username, String password) {
this(url, username, password, "ISO-8859-1");
}
public TomcatManager(URL url, String username, String password, String charset) {
this(url, username, password, charset, true);
}
public TomcatManager(URL url, String username, String password, String charset, boolean verbose) {
this.url = url;
this.username = username;
this.password = password;
this.charset = charset;
this.verbose = verbose;
// 创建网络请求相关的配置
PoolingClientConnectionManager poolingClientConnectionManager = new PoolingClientConnectionManager();
poolingClientConnectionManager.setMaxTotal(5);
this.httpClient = new DefaultHttpClient(poolingClientConnectionManager);
if (StringUtils.isNotEmpty(username)) {
Credentials creds = new UsernamePasswordCredentials(username, password);
String host = url.getHost();
int port = url.getPort() > -1 ? url.getPort() : AuthScope.ANY_PORT;
httpClient.getCredentialsProvider().setCredentials(new AuthScope(host, port), creds);
AuthCache authCache = new BasicAuthCache();
BasicScheme basicAuth = new BasicScheme();
HttpHost targetHost = new HttpHost(url.getHost(), url.getPort(), url.getProtocol());
authCache.put(targetHost, basicAuth);
localContext = new BasicHttpContext();
localContext.setAttribute(ClientContext.AUTH_CACHE, authCache);
}
}
/** 根据指定的path部署并启动一个新的应用程序 */
public TomcatManagerResponse deploy(String path, File war, boolean update) throws Exception {
StringBuilder buffer = new StringBuilder("/deploy");
buffer.append("?path=").append(URLEncoder.encode(path, charset));
if (war != null) {
buffer.append("&war=").append(URLEncoder.encode(war.toString(), charset));
}
if (update) {
buffer.append("&update=true");
}
return invoke(buffer.toString());
}
/** 获取所有已部署的web应用程序的上下文路径。格式为path:status:sessions(活动会话数) */
public TomcatManagerResponse list() throws Exception {
StringBuilder buffer = new StringBuilder("/list");
return invoke(buffer.toString());
}
/** 获取系统信息和JVM信息 */
public TomcatManagerResponse serverinfo() throws Exception {
StringBuilder buffer = new StringBuilder("/serverinfo");
return invoke(buffer.toString());
}
/** 真正发送请求的方法 */
private TomcatManagerResponse invoke(String path) throws Exception {
HttpRequestBase httpRequestBase = new HttpGet(url + path);
HttpResponse response = httpClient.execute(httpRequestBase, localContext);
int statusCode = response.getStatusLine().getStatusCode();
switch (statusCode) {
case HttpStatus.SC_OK: // 200
case HttpStatus.SC_CREATED: // 201
case HttpStatus.SC_ACCEPTED: // 202
break;
case HttpStatus.SC_MOVED_PERMANENTLY: // 301
case HttpStatus.SC_MOVED_TEMPORARILY: // 302
case HttpStatus.SC_SEE_OTHER: // 303
String redirectUrl = getRedirectUrl(response);
this.url = new URL(redirectUrl);
return invoke(path);
}
return new TomcatManagerResponse().setStatusCode(response.getStatusLine().getStatusCode())
.setReasonPhrase(response.getStatusLine().getReasonPhrase())
.setHttpResponseBody(IOUtils.toString(response.getEntity().getContent()));
}
/** 提取重定向URL */
protected String getRedirectUrl(HttpResponse response) {
Header locationHeader = response.getFirstHeader("Location");
String locationField = locationHeader.getValue();
// is it a relative Location or a full ?
return locationField.startsWith("http") ? locationField : url.toString() + '/' + locationField;
}
}
封装响应结果集
@Data
public class TomcatManagerResponse {
private int statusCode;
private String reasonPhrase;
private String httpResponseBody;
}
测试远程部署
在测试之前请先在配置文件放通下面用户权限：
<role rolename="admin-gui"/> <role rolename="admin-script"/> <role rolename="manager-gui"/> <role rolename="manager-script"/> <role rolename="manager-jmx"/> <role rolename="manager-status"/> <user username="sqdyy" password="123456" roles="manager-gui,manager-script,manager-jmx,manager-status,admin-script,admin-gui"/>
下面是测试成功远程部署war包的代码：
import static org.testng.AssertJUnit.assertEquals;
import java.io.File;
import java.net.URL;
import org.testng.annotations.Test;
public class TestTomcatManager {
@Test
public void testDeploy() throws Exception {
TomcatManager tm = new TomcatManager(new URL("http://localhost:8080/manager/text"), "sqdyy", "123456");
File war = new File("E:\tomcat\simple-war-project-1.0-SNAPSHOT.war");
TomcatManagerResponse response = tm.deploy("/simple-war-project-1.0-SNAPSHOT", war, true);
System.out.println(response.getHttpResponseBody());
assertEquals(200, response.getStatusCode());
// output:
// OK - Deployed application at context path /simple-war-project-1.0-SNAPSHOT
}
@Test
public void testList() throws Exception {
TomcatManager tm = new TomcatManager(new URL("http://localhost:8080/manager/text"), "sqdyy", "123456");
TomcatManagerResponse response = tm.list();
System.out.println(response.getHttpResponseBody());
assertEquals(200, response.getStatusCode());
// output:
// OK - Listed applications for virtual host localhost
// /:running:0:ROOT
// /simple-war-project-1.0-SNAPSHOT:running:0:simple-war-project-1.0-SNAPSHOT
// /examples:running:0:examples
// /host-manager:running:0:host-manager
// /manager:running:0:manager
// /docs:running:0:docs
}
@Test
public void testServerinfo() throws Exception {
TomcatManager tm = new TomcatManager(new URL("http://localhost:8080/manager/text"), "sqdyy", "123456");
TomcatManagerResponse response = tm.serverinfo();
System.out.println(response.getHttpResponseBody());
assertEquals(200, response.getStatusCode());
// output:
// OK - Server info
// Tomcat Version: Apache Tomcat/7.0.82
// OS Name: Windows 10
// OS Version: 10.0
// OS Architecture: amd64
// JVM Version: 1.8.0_144-b01
// JVM Vendor: Oracle Corporation
}
}
参考资料
ManagerServlet 源码地址
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。
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