无法反序列化java.util.ArrayList的实例

Question

我在尝试从JSON文件获取数据时遇到了麻烦。我的JAVA端正在工作，但是在组装JSON的PHP中进行了更改，因为我无法执行解析器，因此我不知道在PHP中知道我正在获取的JSON格式，但是我可以访问代码。JSON挂载的页面是这样的：

<?php

    $startTime = microtime(true);

    include_once("../utils/config.php");

    include_once("../utils/utils.php");

    include_once("../services/rest.utils.php");

    header("Content-Type: application/json",true);

    $from = getADate('from', true);

    $to = getADate('to', false);

    $fromDate = '';

    $toDate = '';

    if ($from <> '') { $fromDate = $from; }

    if ($to <> 'NULL') { $toDate = $to; }

    $body = file_get_contents('php://input');

    if (signatureCheck($body)) {

        $cta = 0;

        $database = conectaDatabase();

        $script = '';

        $pfx = Config::getPrefixo();

        $sql = "SELECT RelatorioID, ProfessorID, AlunoID, TurmaID,

                Bimestre, Data, TipoRelatorio, Conteudo, Situacao FROM {$pfx}Relatorios

                WHERE Data >= $fromDate";

        if ($toDate <> '') { 

            $sql .= " AND Data < $toDate";

        }   

        $qry = $database->query($sql);

        $lista = array();

        $cta = 0;

        while ($row = $qry->fetchObject()) {

            $row->TipoRelatorio = utf8_encode($row->TipoRelatorio);

            $row->Conteudo = utf8_encode($row->Conteudo);

            $lista[] = $row;

            $cta++;

        }

        @$output->response = new StdClass(); // Anonymous object, remove the warning

        $output->response->descricao = "$cta relatórios importados";

        $output->response->status = 200;

        $output->relatorios = $lista;

        $endTime = microtime(true);

        $timeSpent = $endTime - $startTime;

        $output->response->timeSpent = $timeSpent;

        $saida = json_encode($output, JSON_UNESCAPED_UNICODE);

        echo $saida;

        desconectaDB($database);

    }

Answer 1

问题是您的JSON如下所示：{&nbsp; "response": {&nbsp; &nbsp; ...&nbsp; },&nbsp; "relatorios": [&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; ...&nbsp; &nbsp; }&nbsp; ]}您正在尝试将其直接映射到relatorios列表。您应该RestResponse改为创建另一个对象。这应该包含整个JSON响应内容：public class RestResponse {&nbsp; &nbsp; private MyResponse response;&nbsp; &nbsp; private List<RelatorioResponse> relatorios;&nbsp; &nbsp; // getter and setter}该response对象应代表responseJSON中的部分。如果不需要，也可以添加@JsonIgnoreProperties(ignoreUnknown = true)到RestResponse类中并忽略response属性：@JsonIgnoreProperties(ignoreUnknown = true)public static class RestResponse {&nbsp; &nbsp; private List<RelatorioResponse> relatorios;&nbsp; &nbsp; // getter and setter}您的请求代码应如下所示：HttpEntity<String> entity = new HttpEntity<>("parameters", new HttpHeaders());ResponseEntity<RestResponse> response = new RestTemplate().exchange(targetUrl, HttpMethod.GET, entity, RestResponse.class);List<RelatorioResponse> responses = response.getBody().getRelatorios();