好的，这是我第一次在这里发帖，所以如果您发现我需要更正某些内容，请告诉我。

当我尝试使用 ajax 将数据发布到 api 时遇到问题。我使用 tomcat8 作为我的网络服务器。我在我的 Controller 中添加了其他人建议的 @CrossOrigin 注释。我还在 servlet.xml 的 allowed-headers 中添加了 localhost:9000 作为 allowed-origin 和 Authorization，但仍然没有成功。

这是我的ajax代码:

var my_url = "http://localhost:8088/booking/api/saveTransaction"; 
var username = "user111"; 
var password = "userpass111"; 
 
              $.ajax({ 
                  method: "POST", 
                  url: my_url, 
                  dataType: "json", 
                  headers: { 
                    'Authorization':'Basic ' + btoa(username+":"+password), 
                    'Content-Type':'x-www-form-urlencoded' 
                  }, 
                  data: JSON.stringify(my_data), 
                  success: function(data){ 
                    alert(data); 
                  }, 
                  error: function(xhr, status, error){ 
                    alert(xhr); 
                    alert(status); 
                    alert(error); 
                  } 
              }); 

在我的 Controller 中

@CrossOrigin(origins = "http://localhost:9000") 
@RequestMapping(value = "/api/saveTransaction", method = RequestMethod.POST) 
public ResponseEntity<BiyaheApplicationResult> saveTransaction(Authentication authentication, @RequestBody CompanyTransaction transaction) { 
 
    System.out.println("\n\n"); 
    System.out.println("START-SAVE-TRANSACTION"); 
    System.out.println("\n\n"); 
 
    BiyaheApplicationResult result = null; 
 
    if(null != transaction) transaction.setTransactionDate(new Date()); 
 
    System.out.println("\n\n"); 
    System.out.println("TEST: SAVE-JSON-TRANSACTION"); 
    System.out.println("--------------------------------------------"); 
    System.out.println("[transaction]: " + BiyaheTextFormatter.serializeToJson(transaction)); 
    System.out.println("--------------------------------------------"); 
    System.out.println("\n\n"); 
 
    String username = authentication.getName(); 
    User user = this.userService.findUserByUsername(username); 
    UserProfileView profile = this.userProfileViewService.getUserProfileViewById(user.getId()); 
 
    int companyId = -1; 
    int branchId = -1; 
    String loadingScheme = null; 
    if(null != profile){ 
        if(BiyaheConstants.JGGC_HQ_COMPANY_ID < profile.getCompanyId()){ 
            companyId = profile.getCompanyId(); 
            CompanyConfiguration conf = this.companyConfigurationService.getCompanyConfigurationByCompanyId(companyId); 
            loadingScheme = conf.getLoadingScheme(); 
        } 
 
        if(BiyaheConstants.JGGC_HQ_BRANCH_ID < profile.getBranchId()){ 
            branchId = profile.getBranchId(); 
        } 
    } 
 
    double currentLoad = 0; 
 
    boolean isSufficientLoad = false; 
    if(BiyaheConstants.LOADING_SCHEME_CENTRALIZED.equalsIgnoreCase(loadingScheme)){ 
        CompanyLoadInfo coLoadInfo = this.companyLoadInfoService.getCompanyLoadInfoByCompanyId(companyId); 
        if(null != coLoadInfo) { 
            currentLoad = coLoadInfo.getCentralizeLoadAmount(); 
            isSufficientLoad = coLoadInfo.getCentralizeLoadAmount() > transaction.getTotalAmount(); 
        } 
    } 
    else if(BiyaheConstants.LOADING_SCHEME_DISTRIBUTED.equalsIgnoreCase(loadingScheme)){ 
        BranchLoadInfo branchLoadInfo = this.branchLoadInfoService.getBranchLoadInfoByBranchId(branchId); 
        if(null != branchLoadInfo) { 
            currentLoad = branchLoadInfo.getBranchLoad(); 
            isSufficientLoad = branchLoadInfo.getBranchLoad() > transaction.getTotalAmount(); 
        } 
    } 
 
    System.out.println("\n\n"); 
    System.out.println("SAVE-TRANSACTION"); 
    System.out.println("--------------------------------------------"); 
    System.out.println("[username]: " + username); 
    System.out.println("[company]: " + profile.getCompanyName()); 
    System.out.println("[branch]: " + profile.getBranchName()); 
    System.out.println("[loading-scheme]: " + loadingScheme); 
    System.out.println("[current-load-balance]: " + currentLoad); 
    System.out.println("[transactionAmount]: " + transaction.getTotalAmount()); 
    System.out.println("[itemPrice]: " + transaction.getItemPriceTotal()); 
    System.out.println("[totalMarkup]: " + transaction.getMarkUpTotal()); 
    System.out.println("[isSufficientLoad]: " + isSufficientLoad); 
    System.out.println("--------------------------------------------"); 
    System.out.println("\n\n"); 
 
    if(isSufficientLoad){ 
        /* 
        { 
            "transactionDate":null, 
            "transactionType":"HOTEL", 
            "transactionCode":"SOGO-6969", 
            "totalAmount":2500.0, 
            "itemPriceTotal":2250.0, 
            "markUpTotal":250.0, 
            "quantity":1.0, 
            "customerName":"Rowena Palami", 
            "customerEmail":"weng.palami@gmail.com", 
            "customerContact":"(0918) 222-6969", 
            "customerAddress":"Room #69 SOGO Hotel, Guadalupe, EDSA, MM" 
        } 
        * */ 
 
        String generatedReservationCode = null; 
        do { 
            generatedReservationCode = this.biyaheTransactionService.generateTransactionCode(10); 
        } 
        while(this.biyaheFlightSalesService.checkReservationCodes(generatedReservationCode)); 
 
        BiyaheSales sale = transaction.toBiyaheSales(); 
        sale.setReservationCode(generatedReservationCode); 
 
        sale.setTransactionDate(new Date()); 
        sale.setAgent(user); 
 
        System.out.println("\n\n"); 
        System.out.println("API :: SAVE-TRANSACTION"); 
        System.out.println("------------------------------------------------"); 
        System.out.println(sale.toString()); 
        System.out.println("------------------------------------------------"); 
        System.out.println("\n\n"); 
 
        this.biyaheFlightSalesService.addUpdateBiyaheFlightSales(sale); 
 
        result = new BiyaheApplicationResult(SUCCESS_CODE_TRANSACTION_SAVE, SUCCESS_DISPLAY_TRANSACTION_SAVE); 
        return new ResponseEntity(BiyaheTextFormatter.serializeToJson(result), HttpStatus.OK); 
    } 
    else { 
        result = new BiyaheApplicationResult("ERROR", null, ERROR_CODE_INSUFFICIENT_BALANCE, ERROR_DISPLAY_INSUFFICIENT_BALANCE); 
        return new ResponseEntity(BiyaheTextFormatter.serializeToJson(result), HttpStatus.NOT_ACCEPTABLE); 
    } 
} 

在我的 Servlet 上下文中

<mvc:annotation-driven /> 
 
<mvc:cors> 
    <mvc:mapping path="/api/**" 
                 allowed-origins="http://localhost:9000/" 
                 allowed-methods="POST, GET, PUT, OPTIONS, DELETE" 
                 allowed-headers="X-Auth-Token, Content-Type, Authorization" 
                 exposed-headers="custom-header1, custom-header2" 
                 allow-credentials="false" 
                 max-age="4800" /> 
 
    <mvc:mapping path="/**" 
                 allowed-origins="http://localhost:9000/" 
                 allowed-methods="POST, GET, PUT, OPTIONS, DELETE" 
                 allowed-headers="X-Auth-Token, Content-Type, Authorization" 
                 exposed-headers="custom-header1, custom-header2" 
                 allow-credentials="false" 
                 max-age="4800" /> 
</mvc:cors> 

在我的 Web 控制台中，我收到 ->“跨源请求被阻止:同源策略不允许读取 http://localhost:8088/booking/api/saveTransaction 处的远程资源。(原因:CORS header ‘Access-Control-Allow-Origin’丢失)。”

我有这 2 个不同的域:localhost:9000 和 localhost:8088

localhost:9000 需要发布到 localhost:8088

Note: I already done this in PHP but this time, I need to use only ajax

我已经为此工作了三天，所以如果有人对此有答案，请帮助我。预先感谢您!

请您参考如下方法:

COR 可能很棘手，但我认为您的问题很简单，就是您没有将“Access-Control-Allow-Origin” header 返回给您的客户端。您可以在 servlet 上下文的节号中看到这一点。

您可能尝试的第一件事就是简单地删除节号，这应该允许所有 header 。