Java项目:在线考试系统(单多选,判断,填空,简答题)java+Springboot+ssm+mysql+html+maven

package com.model; import com.common.Model; /** * 与数据库图片表<image>对应 * */ public class Image implements Model { /**系统默认图片*/ public static final String default_image = "data:image/png;base64,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"; public static final String student_image = "data:image/jpeg;base64,/9j/4QAwRXhpZgAATU0AKgAAAAgAAQExAAIAAAAOAAAAGgAAAAB3d3cubWVpdHUuY29tAP/bAEMABgQFBgUEBgYFBgcHBggKEAoKCQkKFA4PDBAXFBgYFxQWFhodJR8aGyMcFhYgLCAjJicpKikZHy0wLSgwJSgpKP/bAEMBBwcHCggKEwoKEygaFhooKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKCgoKP/AABEIAGQAZAMBEQACEQEDEQH/xAAfAAABBQEBAQEBAQAAAAAAAAAAAQIDBAUGBwgJCgv/xAC1EAACAQMDAgQDBQUEBAAAAX0BAgMABBEFEiExQQYTUWEHInEUMoGRoQgjQrHBFVLR8CQzYnKCCQoWFxgZGiUmJygpKjQ1Njc4OTpDREVGR0hJSlNUVVZXWFlaY2RlZmdoaWpzdHV2d3h5eoOEhYaHiImKkpOUlZaXmJmaoqOkpaanqKmqsrO0tba3uLm6wsPExcbHyMnK0tPU1dbX2Nna4eLj5OXm5+jp6vHy8/T19vf4+fr/xAAfAQADAQEBAQEBAQEBAAAAAAAAAQIDBAUGBwgJCgv/xAC1EQACAQIEBAMEBwUEBAABAncAAQIDEQQFITEGEkFRB2FxEyIygQgUQpGhscEJIzNS8BVictEKFiQ04SXxFxgZGiYnKCkqNTY3ODk6Q0RFRkdISUpTVFVWV1hZWmNkZWZnaGlqc3R1dnd4eXqCg4SFhoeIiYqSk5SVlpeYmZqio6Slpqeoqaqys7S1tre4ubrCw8TFxsfIycrS09TV1tfY2dri4+Tl5ufo6ery8/T19vf4+fr/2gAMAwEAAhEDEQA/APoPx74xsvBmlRXt/FNN5sgijjiAyTjPfgcCmlcTdjgv+F96N/0CNR/NP8arkZPOg/4X3o3/AECNR/NP8aORhzoP+F96N/0CNR/NP8aORhzoP+F96N/0CNR/NP8AGjkYc6D/AIX3o3/QI1H80/xo5GHOg/4X3o3/AECNR/NP8aORhzoP+F96N/0CNR/NP8aORhzoP+F96N/0CNR/NP8AGjkYc6D/AIX3o3/QI1H80/xo5GHOg/4X3o3/AECNR/NP8aORhzotaX8cdFvtStbRtOv4RPIsfmNtIUk4BIBo5GHOj1moLOK+K3gyXxroUFpa3aW1xBN5qNIpKtwQQcc96qLsTJXPnn4ieAb7wNBZS6heW1yLt2RRAGG3aAec/WrUrkONjifPX0NMkPPX0NAB56+hoAPPX0NAB56+hoAPPX0NAB56+hoAPPX0NADo5BJIiAEFmCg/U4ouB7hoPwO1SDVbC6vNWsvs0UqSsIkYuQCDgZ4qXMtQPf6zNAoA8P8A2oEDafoG4f8ALaX/ANBFXAiZ4B5Sen61oZh5Sen60AHlJ6frQAeUnp+tAB5Sen60AHlJ6frQAeUnp+tAB5Sen60ASWsSfa4OP+Wi9/cUgPuiD/UR/wC6P5Vibj6ACgDwj9oi+t9Rv9O0qNj51pumlYdtwAC/kM1z1cV7KXKlc9LC5b9ZhzydkeQJpQd1VZGyTgcVn/aEv5Tp/sSH87+40v8AhF4u92//AHyKPr7/AJRf2JD+d/cL/wAIvF/z9v8A98ij6+/5Q/sSH87+4P8AhF4v+fp/++BR9ff8of2JD+d/cH/CLxf8/T/98Cj6+/5Q/sSH87+4P+EXi/5+n/74FH19/wAof2JD+d/cH/CLxf8AP0//AHwKPr7/AJQ/sSH87+4P+EXi/wCfp/8AvgUfX3/KH9iQ/nf3Do/DUccqOLpzsYNjaOcHNH19/wAof2JD+d/cfWWhX8OqaRa3lscxyoDg9QehH4GuqE1NcyPJrUnSm4S6F+qMxsjrHGzuQFUZJNDdhpXdkfNWuaFret61e6jLEim5mZgHkGQueOPYYrxp3lJyPqqVWlSgoLodJ4b8F6fbsJLsNdSqOSxwufYChRM3iZyemiOri0qwjGI7K3A/65g0WI55PqJJpOnyDD2Vuf8AgAFFgVSS6lGfwvpUo4t2jPqjkUWLVea6mdP4Kt2P7i7lT2ZQ1LlLWJfVFR/BM2fkvYiPdCKOUr6yuw6PwRKT+8vUA/2YyaLB9ZXRGjZ+D7CEg3Dy3B9Cdo/SnYiWIk9ibXNAtJ9LkSztoop0GY2UY/AmhomFZxleT0Nz4TNc2tld6deADY/mRfNnIPXH4j9a7cJLRxZ5uZ8s5KpE76uw8owPGrSLpKhM7GkAfHp/+uubFN8mh1YRLn1OFrgPTNLTf9S3+9QXHY5n4pWGr6hoFvFoKztcC5RnEL7Tt59+mcV0YaUIy985sZGcoJU97nXwhhDGJPvhQG+uOa52dK2G3FxBbR+ZczRwx5C7pGCjJ6DJppN7A2lqxJriCF4kmmijeU7Y1ZwC59B60JN7A2luyWkM4vx9p+tXms+G5NHWc28FzuuDG+0KMjlueRjNdFGUFGXMcmJjUlODh31O1PU1znWMk/1bZ9DQBn6Q0ianamDPmeYAMd/WrptqSsc9VJwdz06vVPGI7iGO4haKZA8bDBU96TSkrMcZOLujltW8MQw2s89pJLlF3CM8/WuSphkk3E7aWKbkoyMDTHwzIe/IrjPRiOvdPNzN5n2maPjG1TxTTOuliPZxtyplizg+zQCPzHkwc7nPNIyq1PaS5rWKXiLQ7HxDprWOpxl4CwYbWwysOhB9aunUlTfNE56tKNWPLI5vRvhtpGnalBezXF7fS27BoVuJMrGR0OBW08VOStsc9PBQhJSbbsdvXMdhn3WmGedpPtU6bv4VPAp3OqnieSKjyply3j8mFI97PtGNzdTSOecueTlaxdsbI385g3FFKkswHQVpSp+0lY569X2UOY3tK0K005/MQNJN0Dv2+ld1OhGGp5dTESqaPY1a2MAoADyMHpQBwHiHTX0u986EH7O7ZU9lP9015telyO62PVw9b2is90EMqyoGX8R6Vididx9ABQAUAFABQAqgswCgkngAd6NwbtqzrNGsfsdvl/8AWvy3t7V6VClyR13PHxNb2stNkX62OYKACgAoAjuYIrmF4p0DxsMEGlKKkrMcZOLujj9Q8PXVjI0unkzQ/wBz+ID+tcNTDOOsdUejSxaektGUYrhXO1wY5BwVbiuY7lJMmoGFABQBPa2k902IYy3v2H41cISn8KM6lWFNXkzpNM0uOzw7kPN69h9K7qVBQ1e55lfEurotEaNbnKFABQAUAFABQBwnj74m6N4Pv7XT52NxqEzLuijI/cof439Pp1NNK4nKxrm1jvws94Un3qCu37uD0xUShGW6NY1JQ+FnO+Mre60nTBe6OMrE376N8t8vqPpXLVw8UrxPWy2rGtU9lWe+3qcloviLWNX1KCytorfdI3zMEJ2r3J5rCNPmdkeziMNRw9N1Jt6HqkdjBHj5Nx9W5rtjQhHofKyxVWXWxkeMPHen+C47Aaijyi5k2hIgNyIOr47gcVvGN9jmlLqzrdNvrXU7GG8sJkntplDxyIchhSAs0AFABQAUAFAHN/EXxPF4P8HalrUwDPBHiFD/AByHhF/Mj8M00Jux8UQ3l3qmoXGpanM097dOZJJGPLE1qjJnufwh+I8VlDFoXiGbZAvy2t054Qf3HPp6GplHqi4y6M9F+KWoGx8CahLC4zOqwoynqGPJB+mawqO0WetlFJVcXBPpr9x458Kb9rHxzp3zEJOTAwz1DDj9QK56TtI+ozel7XCT8tT3Txb4n03wtpzXWpzAOR+6gU/vJT6Af16V2JXPhG7Hy74t8Q3nibW5tS1BgGf5Y4wfliQdFFapWMW7npH7PXi2Sx1tvD13KTZXmXtwTwko5IH+8P1FTNdSoPofRlZmgUAFABQAUAeKftTi6uPCOk2VpDNMs17vcRoW4VTjOPrVRJkfPsGj38flD+z7zp/zwf8AwrQzLn9l6h/0D7z/AL8P/hTCxpC58R/2WNNZNTewVw6wPE7KpHTGRxUThGaszqwmLq4SftKW5Hbf21a3MVxbWd5FPEwdHW3fKkdD0rNYeCdz0K+e4qtB07JJ+RHqMet6ndvdajDqVzcP1klidj/KtzxdSjPpmoeX/wAeF5/34f8AwpBY1vC9vqNh4i0m7WxvAYbmJ8+Q46MPah7Atz7PrE2CgAoAKACgAoAKACgAoAKACgAoAKACgAoAKAP/2Q=="; public static final String teacher_image = "data:image/jpeg;base64,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