使用POST請求實現頁面的跳轉

項目情景:

當用戶選擇幾個item之后,點擊 查看 按鈕之后, 頁面跳轉到展示items詳情頁面.

實現:

如果可以使用get請求, 直接在前端使用windows.loaction.href = "newUrl="xxx"&item=itemValue1&item=itemValue2"就行了

這樣的問題是如果item比較多, 就有可能超出URL長度限制. 所以考慮用POST實現跳轉.

server端:

@SlingServlet(resourceTypes = "/apps/xxx/components/pages/xxx-contentpage",
    extensions = "html",
    selectors = "selected",
    methods = {"GET", "POST"},
    metatype = true
)

public class MyServlet extends SlingAllMethodsServlet {
    @Override
    protected void doPost(SlingHttpServletRequest request, SlingHttpServletResponse response) throws ServletException, IOException {
        String newUrl= request.getParameter("newUrl");
        RequestDispatcher dispatcher = request.getRequestDispatcher(newUrl);
        GetRequest getRequest = new GetRequest(request);
        dispatcher.forward(getRequest, response);
    }

    @Override
    protected void doGet(SlingHttpServletRequest request, SlingHttpServletResponse response) throws ServletException, IOException {

　　　　doPost(request, response);

 } 

　　/** Wrapper class to always return GET for AEM to process the request/response as GET. */ 

private static class GetRequest extends SlingHttpServletRequestWrapper { 

public GetRequest(SlingHttpServletRequest wrappedRequest) { super(wrappedRequest); } 

@Override 

public String getMethod() { return "GET"; } 
} 

}

如果直接forward POST request,會報錯:

500 error - operations.ModifyOperation Exception during response processing 

所以必須把request轉換成GET request.

 

前端:

如果使用ajax提交請求,返回的將是新頁面的html代碼. 必須用form提交請求.

 提示: form里面的action URL 與 servlet 的newUrl 必須不一樣 ,否則會發生無限循環錯誤.

 

參考: http://suryakand-shinde.blogspot.com/2016/07/aem-form-submission-handling-post.html

forward()和sendRedirect()的區別: https://examples.javacodegeeks.com/enterprise-java/servlet/java-servlet-sendredirect-example/