{"id":1875,"date":"2016-12-29T17:28:45","date_gmt":"2016-12-29T09:28:45","guid":{"rendered":"https:\/\/ai.zhousir.top\/?p=1875"},"modified":"2026-08-18T11:20:22","modified_gmt":"2026-08-18T03:20:22","slug":"ognl%e8%a1%a8%e8%be%be%e5%bc%8f","status":"publish","type":"post","link":"https:\/\/ai.zhousir.top\/?p=1875","title":{"rendered":"OGNL\u8868\u8fbe\u5f0f"},"content":{"rendered":"
\n

OGNL<\/strong> \u5168\u79f0 Object-Graph Navigation Language\uff08\u5bf9\u8c61\u56fe\u5bfc\u822a\u8bed\u8a00\uff09\uff0c\u7528\u6765\u83b7\u53d6\u548c\u8bbe\u7f6e Java \u5bf9\u8c61\u5c5e\u6027\uff0c\u9700\u8981\u5199\u5728 Struts2 \u6807\u7b7e<\/strong>\u91cc\u624d\u751f\u6548\u3002<\/p>\n

\u5b83\u8bbf\u95ee\u7684\u5bf9\u8c61\u90fd\u653e\u5728 OGNL \u7684 context<\/strong> \u91cc\u3002context \u662f Map\uff0c\u5b58\u4e00\u7ec4 key-value\uff0c\u5b9e\u9645\u5bf9\u5e94 ActionContext<\/code>\u3002<\/p>\n

Http \u8bf7\u6c42\u8fdb\u5230 Struts2 \u540e\uff0c\u6846\u67b6\u4f1a\u521b\u5efa ActionContext\u3001ValueStack \u548c\u5bf9\u5e94\u7684 Action\uff1bAction \u653e\u8fdb ValueStack\uff0cValueStack \u518d\u653e\u8fdb ActionContext\u3002\u5728 JSP \u91cc\u8bbf\u95ee context \u6570\u636e\u8981\u7528 #<\/code>\uff1bValueStack \u662f\u6839\u5bf9\u8c61\uff0c\u8bbf\u95ee Action \u5c5e\u6027\u4e0d\u7528\u52a0 #<\/strong>\u3002<\/p>\n

\u4e00\u3001OGNL \u4ecb\u7ecd<\/h2>\n

\u8bb0\u4f4f\u8fd9\u6761\u94fe\u5c31\u591f\u7528\uff1a<\/p>\n

ognl \u4e0a\u4e0b\u6587(context) <=> ActionContext <- ValueStack <- action \u5bf9\u8c61<\/code><\/pre>\n
\u503c\u6808 ValueStack \u91cc\u5e38\u89c1\u5bf9\u8c61\uff1aaction \u5b9e\u4f8b\u3001request\u3001session\u3001application\u3001response\u3001parameters \u6570\u7ec4\u3001attr \u7b49\u3002<\/p>\n
\u4e8c\u3001\u4e3b\u8981\u529f\u80fd<\/h2>\n
    \n
  • \n
    \u53d6\u6570\u636e\uff1a\u7528\u4e00\u6bb5\u5f88\u77ed\u7684\u8868\u8fbe\u5f0f\u53d6\u51fa\u5404\u79cd\u6570\u636e\u3002<\/section>\n<\/li>\n
  • \n
    \u9644\u5e26\u4fbf\u6377\u80fd\u529b\uff1a\u65b9\u6cd5\u8c03\u7528\u3001\u9759\u6001\u65b9\u6cd5\u548c\u5c5e\u6027\u8c03\u7528\u3001\u6570\u503c\u8fd0\u7b97\u7b49\u3002<\/section>\n<\/li>\n<\/ul>\n
    \u4e09\u3001\u5982\u4f55\u53d6\u6570\u636e<\/h2>\n
    OGNL \u4ece\u4e24\u4e2a\u5730\u65b9\u53d6\u6570\u636e\uff1a\u4e00\u662f Action \u5b9e\u4f8b\u5c5e\u6027\uff0c\u4e8c\u662f ValueStack\uff08\u503c\u6808\uff09\u3002\u4f1a\u5148\u4ece\u524d\u4e00\u4e2a\u53d6\uff0c\u53d6\u4e0d\u5230\u518d\u5230\u503c\u6808\u3002\u503c\u6808\u91cc\u5b58\u4e86 request\u3001session\u3001application\u3001response\u3001action \u5b9e\u4f8b\u3001parameters \u6570\u7ec4\u7b49\u3002<\/p>\n
    1. \u53d6 Action \u5b9e\u4f8b\u7684\u5c5e\u6027<\/h3>\n
    Action \u5c5e\u6027\u53ef\u4ee5\u76f4\u63a5\u5728 Struts2 \u6807\u7b7e\u91cc\u7528\u5c5e\u6027\u540d\u62ff\u5230\uff0c\u4e0d\u8981\u52a0 #<\/code>\uff1a<\/p>\n
    <s:property value=\"name\"\/>\n<s:property value=\"user.password\"\/><\/code><\/pre>\n
    2. \u53d6 ValueStack \u4e2d\u7684\u6570\u636e<\/h3>\n
    Struts2 \u63d0\u4f9b\u4e09\u79cd\u5199\u6cd5\uff1a#<\/code>\u3001%{}<\/code>\u3001${}<\/code>\u3002#<\/code> \u548c %{}<\/code> \u8981\u653e\u5230 Struts2 \u6807\u7b7e\u91cc\u624d\u751f\u6548\uff1a<\/p>\n
    <s:property value=\"#name\"\/>\n<s:property value=\"%{'hello struts2'}\"\/><\/code><\/pre>\n
    %<\/code> \u7684\u7528\u9014\u662f\uff1a\u6807\u7b7e\u5c5e\u6027\u88ab\u5f53\u6210\u5b57\u7b26\u4e32\u65f6\uff0c\u544a\u8bc9\u8fd0\u884c\u73af\u5883 %{}<\/code> \u91cc\u662f OGNL \u8868\u8fbe\u5f0f\uff1a<\/p>\n
    <s:url value=\"%{#myMap['key1']}\"\/><\/code><\/pre>\n
    \u6700\u5e38\u7528\u7684\u8fd8\u662f #<\/code>\uff1a<\/p>\n\n\n\n\n\n\n\n\n\n\n
    \u5199\u6cd5<\/th>\n\u542b\u4e49<\/th>\n<\/tr>\n<\/thead>\n
    #session.name2 \/ #application.name3<\/td>\n\u53d6 session\u3001application \u91cc\u7684 attribute\uff0c\u8981\u52a0\u524d\u7f00<\/td>\n<\/tr>\n
    #name<\/td>\n\u53d6 request \u8303\u56f4 attribute\uff0c\u4e0d\u8981\u52a0 request \u524d\u7f00\uff08\u52a0\u4e0a\u53cd\u800c\u53d6\u4e0d\u5230\uff09\uff1b\u9ed8\u8ba4\u53ea\u4ece request \u53d6\uff0c\u4e0d\u4f1a\u81ea\u52a8\u518d\u5230 session \/ application<\/td>\n<\/tr>\n
    #parameters.name[0]<\/td>\n\u53d6\u8bf7\u6c42\u53c2\u6570\uff0c\u5fc5\u987b\u52a0 parameters\uff0c\u7ed3\u679c\u662f\u6570\u7ec4\uff0c\u7b2c\u4e00\u9879\u52a0\u4e0b\u6807\uff1b\u76f8\u5f53\u4e8e request.getParameterValues(“name”)[0]<\/td>\n<\/tr>\n
    #attr.name<\/td>\n\u6309 request \u2192 session \u2192 application \u987a\u5e8f\u627e attribute\uff0c\u627e\u5230\u5c31\u505c<\/td>\n<\/tr>\n
    #{‘foo1′:’bar1’}<\/td>\n\u7528 # \u6784\u9020 Map<\/td>\n<\/tr>\n
    books.{?#this.price<100}<\/td>\n\u8fc7\u6ee4\u548c\u6295\u5f71\uff08projecting\uff09\u96c6\u5408<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
    <s:property value=\"#session.name2\"\/>\n<s:property value=\"#application.name3\"\/>\n<s:property value=\"#name\"\/>\n<s:property value=\"#parameters.name[0]\"\/>\n<s:property value=\"#attr.name\"\/>\n\n<s:set name=\"foobar\" value=\"#{'foo1':'bar1', 'foo2':'bar2'}\" \/>\n<s:property value=\"#foobar['foo1']\" \/>\n<s:radio list=\"#{'0':'\u7537','1':'\u5973'}\" name=\"sex\" label=\"\u6027\u522b\" value=\"%{user.sex}\"><\/s:radio><\/code><\/pre>\n
    $<\/code> \u6709\u4e24\u79cd\u7528\u9014\uff1a\u56fd\u9645\u5316\u8d44\u6e90\u6587\u4ef6\u91cc\u5f15\u7528 OGNL\uff1b\u4ee5\u53ca\u5728 Struts2 \u914d\u7f6e\u6587\u4ef6\u91cc\u5f15\u7528\uff1a<\/p>\n
    <action name=\"saveUser\" class=\"userAction\" method=\"save\">\n    <result type=\"redirect\">listUser.action?msg=${msg}<\/result>\n<\/action><\/code><\/pre>\n
    \u56db\u3001\u4ee3\u7801\u5b9e\u4f8b<\/h2>\n
    Action \u4fa7\u5f80 context \/ \u503c\u6808\u91cc\u585e\u6570\u636e\uff1a<\/p>\n
    \/**\n * \u901a\u8fc7 ognl \u8868\u8fbe\u5f0f\u4ece ognl \u4e0a\u4e0b\u6587(context)\u83b7\u53d6\u503c\u663e\u793a\u5230 jsp \u9875\u9762\n * ognl \u8868\u8fbe\u5f0f\u53ea\u4f7f\u7528\u5728 struts2 \u6807\u7b7e\u4e2d\n * ognl \u4e0a\u4e0b\u6587(context) <=> ActionContext <- ValueStack <- action \u5bf9\u8c61\n *\n * \u503c\u6808 ValueStack \u5305\u542b\u5982\u4e0b\u5bf9\u8c61:\n * action \u5b9e\u4f8b\u3001request\u3001session\u3001application\u3001response\u3001parameters \u6570\u7ec4  attr...\n *\/\npublic class OgnlAction extends BaseServletAction {\n    private String name;\n    private User user = new User();\n    private List<User> list = new ArrayList<User>();\n\n    @Override\n    public String execute() throws Exception {\n        ActionContext actionContext = ActionContext.getContext();\n        ValueStack valueStack = actionContext.getValueStack();\n        valueStack.push(\"ognl\u540d\u79f0\");\n\n        name = \"\u5f20\u4e09\";\n        user.setName(\"\u674e\u56db\");\n        user.setPassword(\"abcd\");\n\n        list.add(new User(\"\u738b\u4e8c\", \"456\"));\n        list.add(new User(\"\u5c0f\u660e\", \"123\"));\n\n        actionContext.put(\"number\", \"request=1001\");\n        session.setAttribute(\"age\", \"session=23\");\n\n        return SUCCESS;\n    }\n\n    public String getName() { return name; }\n    public void setName(String name) { this.name = name; }\n    public User getUser() { return user; }\n    public void setUser(User user) { this.user = user; }\n    public List<User> getList() { return list; }\n    public void setList(List<User> list) { this.list = list; }\n}<\/code><\/pre>\n
    JSP \u4fa7\u5bf9\u7167\u53d6\u503c\uff1a<\/p>\n
    <body>\n    <!-- \u663e\u793a valuestack \u503c\u6808\u5185\u5bb9 -->\n    <s:property value=\"name\"\/>\n    <s:property value=\"user.name\"\/>\n    <s:property value=\"user.password\"\/>\n\n    <hr>\n    <s:iterator value=\"list\" var=\"u\">\n        <s:property value=\"#u.name\"\/><br>\n    <\/s:iterator>\n\n    <s:property value=\"#number\"\/>\n    <s:property value=\"#session.age\"\/>\n\n    <%-- ognl \u4ece action \u5bf9\u8c61\u4e2d\u53d6\u5c5e\u6027\u503c --%>\n    <s:property value=\"name\" default=\"\u9ed8\u8ba4\u503c\" \/>\n    <s:property value=\"user.username\" default=\"\u9ed8\u8ba4\u503c\" \/>\n\n    <br>\u7528\u6237\u540d:\n    <s:property value=\"userLists[1].username\" default=\"\u9ed8\u8ba4\u503c\" \/>\n    \u5bc6\u7801:\n    <s:property value=\"userLists[1].password\" default=\"\u9ed8\u8ba4\u503c\" \/>\n    <br>\n    <%-- ognl \u4ece ServletAPI request session .... \u5bf9\u8c61\u4e2d\u53d6\u5c5e\u6027\u503c --%>\n    <s:property value=\"#request.age\" default=\"request\u9ed8\u8ba4\u503c\" \/>\n    <s:property value=\"#session.sex\" default=\"session\u9ed8\u8ba4\u503c\" \/>\n    <!-- request > session > application -->\n    <s:property value=\"#attr.age\" default=\"attr\u9ed8\u8ba4\u503c\" \/>\n\n    <%-- ognl \u4ece valueStack \u4e2d\u53d6\u5c5e\u6027\u503c --%>\n    <s:property value=\"stack2.username\" default=\"valueStack\u9ed8\u8ba4\u503c\" \/>\n\n    ${stack2.password}\n    <br> ${user.username}\n\n    <br>\n    <s:form action=\"ognltag.jsp\" method=\"post\">\n        <s:textfield label=\"\u7528\u6237\u540d\" name=\"user_name\"><\/s:textfield>\n        <s:password label=\"\u5bc6\u7801\" name=\"pass_word\"><\/s:password>\n        <s:submit value=\"\u63d0\u4ea4\"><\/s:submit>\n    <\/s:form>\n\n    <s:property value=\"#parameters.user_name\"\/>\n    <s:property value=\"#parameters.pass_word\"\/>\n\n    <s:debug><\/s:debug>\n<\/body><\/code><\/pre>\n
    \n
    \u4e00\u53e5\u8bdd\u603b\u7ed3\uff1aAction \u5c5e\u6027\u76f4\u63a5\u5199\u5c5e\u6027\u540d\uff0ccontext \u91cc\u7684\u6570\u636e\u52a0 #\uff1b#session \/ #parameters \/ #attr \u5404\u7ba1\u4e00\u5c42\u8303\u56f4\uff0c%{} \u53ea\u5728\u6807\u7b7e\u5c5e\u6027\u88ab\u5f53\u6210\u5b57\u7b26\u4e32\u65f6\u628a OGNL \u6253\u5f00\u3002<\/strong><\/p>\n<\/blockquote>\n<\/section>\n","protected":false},"excerpt":{"rendered":"
    OGNL \u5168\u79f0 Object-Graph Navigation Language\uff08\u5bf9\u8c61\u56fe\u5bfc\u822a\u8bed\u8a00\uff09\uff0c\u7528\u6765\u83b7\u53d6\u548c […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[87],"tags":[183,190],"_links":{"self":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/1875"}],"collection":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1875"}],"version-history":[{"count":3,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/1875\/revisions"}],"predecessor-version":[{"id":1977,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/1875\/revisions\/1977"}],"wp:attachment":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1875"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1875"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1875"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}