这篇文章将为大家详细讲解有关怎么通过tomcat中ManagerServlet远程部署项目，小编觉得挺实用的，因此分享给大家做个参考，希望大家阅读完这篇文章后可以有所收获。
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，以确定被请求的操作。它支持以下操作和参数(从servlet路径开始):
请求路径描述
/deploy?config={config-url} 根据指定的path部署并启动一个新的web应用程序(详见源码)
/deploy?config={config-url}&war={war-url}/ 根据指定的pat部署并启动一个新的web应用程序(详见源码)
/deploy?path=http://www.yisu.com/xxx&war={war-url} 根据指定的path部署并启动一个新的web应用程序(详见源码)
/list 列出所有web应用程序的上下文路径。格式为path:status:sessions(活动会话数)
/reload?path=http://www.yisu.com/xxx 根据指定path重新加载web应用
/resources?type=xxxx 枚举可用的全局JNDI资源，可以限制指定的java类名
/serverinfo 显示系统信息和JVM信息
/sessions 此方法已过期
/expire?path=http://www.yisu.com/xxx 列出path路径下的web应用的session空闲时间信息
/expire?path=http://www.yisu.com/xxx&idle=mm Expire sessions for the context path /xxx which were idle for at least mm minutes.
/sslConnectorCiphers 显示当前connector配置的SSL/TLS密码的诊断信息
/start?path=http://www.yisu.com/xx 根据指定path启动web应用程序
/stop?path=http://www.yisu.com/xxx 根据指定path关闭web应用程序
/threaddump Write a JVM thread dump
/undeploy?path=http://www.yisu.com/xxx 关闭并删除指定path的Web应用程序，然后删除底层WAR文件或文档基目录。
我们可以通过ManagerServlet中getPathInfo()提供的操作，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;
}
}
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